948 results on '"Maochun Hong"'
Search Results
152. New 3-D chiral framework of indium with 1,3,5-Benzenetricarboxylate
- Author
-
Zhengzhong Lin, Feilong Jiang, Lian Chen, Daqiang Yuan, and Maochun Hong
- Subjects
Pyridine -- Atomic properties ,Crystals -- Structure ,Crystals -- Research ,X-rays -- Diffraction ,X-rays -- Usage ,Chemistry - Abstract
A new complex, [In(sub 2)(mu-OH)(sub 2)(btc)(sub 2)](sub n). 2nHpy is hydrothermally synthesized from the reaction of InCl(sub 3), H(sub 3)btc, and pyridine. Single crystal X-ray diffraction analyses show the structure of the complex is a nonpenetrated three-dimensional (3-D) anionic framework with homochiral tunnels accommodating protonated pyridine cations. more...
- Published
- 2005
153. Realization of In‐Plane Polarized Light Detection Based on Bulk Photovoltaic Effect in A Polar Van Der Waals Crystal
- Author
-
Wentao Wu, Zhijin Xu, Yunpeng Yao, Yi Liu, Guankui Long, Lina Li, Maochun Hong, and Junhua Luo
- Subjects
Biomaterials ,General Materials Science ,General Chemistry ,Biotechnology - Abstract
2D van der Waals materials are widely explored for in-plane polarized light detection owing to their distinctive in-plane anisotropic feature. However, most of these polarized light-sensitive devices root in their low symmetry of in-plane structure and work depending on external power sources, which greatly impedes the simplification of integrated devices and sustainable development. Bulk photovoltaic effect (BPVE), which separates photoexcited carriers via built-in electric field without an external power source and shows an angle-dependence on light polarization, is promising for self-powered polarized light detection to break through the restriction of in-plane anisotropy. Herein, a 2D lead-free van der Waals perovskite (Cl-PMA) more...
- Published
- 2022
- Full Text
- View/download PDF
154. Room temperature self-healing and recyclable conductive composites for flexible electronic devices based on imine reversible covalent bond
- Author
-
Heqing Fu, Hainan Wang, Maochun Hong, Jinbiao Min, Zhaoxi Zhou, and Qihui Chen
- Subjects
Materials science ,Mechanical Engineering ,Imine ,Metals and Alloys ,Carbon nanotube ,Carbon black ,Hot pressing ,law.invention ,chemistry.chemical_compound ,chemistry ,Mechanics of Materials ,Covalent bond ,law ,Electrical resistivity and conductivity ,Self-healing ,Materials Chemistry ,Composite material ,Electrical conductor - Abstract
With the development of flexible electronic devices, various requirements for flexible conductive materials have been put forward to. However, the self-healing, mechanical and conductive properties of the flexible materials are poor. Therefore, it is important to prepare self-healing materials with good mechanical and conductive properties. In this paper, room temperature self-healing and conductive composites based on imine reversible covalent bond were prepare by introducing of the carbon nanotube and carbon black. The self-healing, mechanical and conductive properties of the composites were studied. And the structure of the composites was also characterized. The experimental results showed that the mechanical strength and the electrical resistivity of composites were 6.6 MPa and 108 Ω·m, respectively. The composites have excellent room temperature self-healing properties through the reversible exchange of imine bond, and the healing efficiency of mechanical properties and the electrical properties can reach 96% and 93%, respectively. At the same time, the self-healing mechanism was put forward to. In addition, the composites can be recovered by solution recovery and hot pressing. more...
- Published
- 2022
- Full Text
- View/download PDF
155. Photon upconversion of all-inorganic CsPbX3 quantum dots based on fluorescence resonance energy transfer in hetero-structured perovskite/upconversion nanocomposites
- Author
-
Yuhan Ma, Maochun Hong, Youchao Wei, Feilong Jiang, and Yongsheng Liu
- Subjects
Materials science ,Photon ,business.industry ,Biophysics ,General Chemistry ,Condensed Matter Physics ,Biochemistry ,Atomic and Molecular Physics, and Optics ,Photon upconversion ,Förster resonance energy transfer ,Nanocrystal ,Quantum dot ,Optoelectronics ,Energy transformation ,business ,Luminescence ,Perovskite (structure) - Abstract
Photo upconversion that converts low-energy light into high-energy photons holds great promise for boosting the energy conversion efficiencies particularly for photovoltaic devices based on all-inorganic CsPbX3 (X = Cl, Br, and I) perovskite quantum dots. However, the realization of nonlinear upconversion luminescence (UCL) from these all-inorganic CsPbX3 perovskites has been met with very limited success until now. Herein, we propose a rational perovskite/upconversion hetero-structured design strategy to achieve excitonic UCL of all-inorganic CsPbX3 perovskites based on fluorescence resonance energy transfer (FRET), where all-inorganic CsPbX3 perovskites and upconverting CaF2:Ln (Ln = Yb3+/Er3+, Yb3+/Ho3+, and Yb3+/Tm3+) nanocrystals are closely integrated with each other as a whole by using a modified two-step epitaxial growth approach, forming the unique upconverting CsPbX3/CaF2:Ln hetero-structured nanocomposites (HSNCs). Benefitting from the extremely high FRET efficiency of ∼99.7%, excitonic UCL from CsPbX3 perovskites can be realized upon low-power density 980-nm diode laser irradiation. More importantly, all the HSNCs are found to outperform their pure CsPbX3 counterparts in terms of air-stability, thermal-stability, and excitonic downconversion luminescence intensity, clearly demonstrating the overwhelming advantages of upconverting HSNCs we prepared over the pure CsPbX3 perovskites for high-performance optoelectronic and photovoltaic applications. more...
- Published
- 2022
- Full Text
- View/download PDF
156. Lanthanide-based NIR-II Fluorescent Nanoprobes and Their Biomedical Applications※
- Author
-
Maochun Hong, Pengming Sun, Yongsheng Liu, Jianxi Ke, and Zhifen Wu
- Subjects
General Chemistry - Published
- 2022
- Full Text
- View/download PDF
157. Syntheses and characterizations of copper(II) polymeric complexes constructed from 1,2,4,5-benzenetetracarboxylic acid
- Author
-
Rong Cao, Qian Shi, Daofeng Sun, Maochun Hong, Wenghua Bi, and Yingjun Zhao
- Subjects
Chemistry, Inorganic -- Research ,Copper compounds ,Polymers ,Coordination compounds ,Carboxylic acids ,Ligands ,Chemistry - Abstract
Research has been conducted on polymeric complexes with rectangular channels. The study of these complexes constructed from Cu(II) ion, auxiliary ligands and 1,2,4,5-benzenetetracarboxylic acid is presented. more...
- Published
- 2002
158. Syntheses and characterizations of cluster compounds with MoFe3Se4 cubane-like core
- Author
-
Qianfeng, Zhang, Rong, Cao, Maochun, Hong, Hanqin, Liu, and Jiaxi, Lu
- Published
- 2000
- Full Text
- View/download PDF
159. Syntheses and characterization of three-dimensional channel-like polymeric lanthanide complexes constructed by 1,2,4,5-benzenetetracarboxylic acid
- Author
-
Rong Cao, Daofeng Sun, Yucang Liang, Maochun Hong, Tatsumi, Kazuyuki, and Qian Shi
- Subjects
Chemistry, Inorganic -- Research ,Carboxylic acids ,Polymers -- Composition ,Rare earth metals -- Composition ,Coordination compounds -- Composition ,Benzene ,Chemistry - Abstract
Research has been conducted on the three-dimensional channel-like lanthanide complexes. The synthesis and characterization of these complexes which have been constructed via the use of various compounds including 1,2,4,5-benzenetetracarboxylic acid have been carried out and the details are reported. more...
- Published
- 2002
160. Preparations, structures, and magnetic properties of a series of novel copper(II)-lanthanide(III) coordination polymers via hydrothermal reaction
- Author
-
Yucang Liang, Maochun Hong, Weiping Su, Rong Cao, and Wenjian Zhang
- Subjects
Chemistry, Inorganic -- Research ,Copper -- Physiological aspects ,Rare earth metals -- Physiological aspects ,Polymers -- Physiological aspects ,Erbium -- Physiological aspects ,Gadolinium -- Physiological aspects ,Samarium -- Physiological aspects ,Carboxylic acids -- Physiological aspects ,Pyridine -- Physiological aspects ,Chemistry - Abstract
Research has been conducted on the hydrothermal reaction of Ln (sub)2 O (sub)3 (Ln- Er, Gd, Sm), pyridine-2,5-dicarboxylic acid and Cu(II) reagents. The results of this reaction indicate that it produces polymeric Cu(II)-Ln(III) complexes. more...
- Published
- 2001
161. Pillar-Assisted Construction of a Three-Dimensional Framework from a Two-Dimensional Bilayer Based on a Zn/Cd Heterometal Cluster: Pore Tuning and Gas Adsorption
- Author
-
Danhua Song, Qihui Chen, Feilong Jiang, Yu-Jie Gao, Linfeng Liang, Maochun Hong, Dong Wu, Haiyang Hou, and Daqiang Yuan
- Subjects
Pore size ,Materials science ,010405 organic chemistry ,Bilayer ,Rational design ,Pillar ,General Chemistry ,010402 general chemistry ,Condensed Matter Physics ,Co2 adsorption ,01 natural sciences ,0104 chemical sciences ,Adsorption ,Chemical engineering ,Cluster (physics) ,General Materials Science ,Porosity - Abstract
Employing a rational design strategy to construct porous metal–organic frameworks (MOFs) with predictable structures for specific applications still remains one of the most compelling challenges. Here, a novel two-dimensional (2D) bilayer (FJI-H16) based on Zn/Cd heterometal clusters has been constructed throughout a heterometal strategy, further introducing pillar ligands with different sizes and flexibilities that expand such 2D bilayer structures into two novel three-dimensional (3D) frameworks (FJI-H17, FJI-H18), in which both the pore size and flexibility of the new-formed 3D frameworks can be tuned. Further gas adsorption research indicates that the less porous FJI-H16 has the highest H2 adsorption, while the very porous FJI-H17 has the highest CO2 adsorption. The relationship between gas adsorption properties and pore characteristics also has been investigated, which will provide a potential strategy that can improve gas adsorption in designing porous MOFs. more...
- Published
- 2018
- Full Text
- View/download PDF
162. Non-Centrosymmetric RbNaMgP2O7 with Unprecedented Thermo-Induced Enhancement of Second Harmonic Generation
- Author
-
Pai Shan, Xiaojun Kuang, Zheshuai Lin, Maochun Hong, Fengqi Lu, Xiaoyan Yang, Sangen Zhao, Yi Yang, Zhihua Sun, and Junhua Luo
- Subjects
Phase transition ,Work (thermodynamics) ,Chemistry ,Second-harmonic generation ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Molecular physics ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,Phase (matter) ,Polar ,Twist ,0210 nano-technology ,Chemical design - Abstract
It is of great difficulty to obtain deep-UV transparent materials with enhanced second harmonic generation (SHG), mainly limited by the theoretically poor transparency of these materials in the deep-UV spectral region. Here we report a new noncentrosymmetric, deep-UV transparent phosphate RbNaMgP2O7, which undergoes a thermo-induced reversible phase transition (at a high temperature of 723 K) and correspondingly an evident SHG enhancement up to ∼1.5 times. The phase transition is aroused by the twist of [P2O7]4– dimers with deviation from the P–O–P equilibrium positions. Theoretical analyses reveal that the enhanced SHG can be ascribed to the thermo-induced collective alignment of SHG-active [P2O7]4– dimers along the polar axis of high-temperature phase. This work provides an unprecedented physical routine (to SHG-enhanced materials) that is distinguished from the traditional one by chemical design and synthesis. more...
- Published
- 2018
- Full Text
- View/download PDF
163. An optoelectronic duple bistable phosphate with ultrahigh thermal stability
- Author
-
Yaoguo Shen, Zujian Wang, Jianghe Feng, Maochun Hong, Sangen Zhao, Junhua Luo, and Chenxi Wang
- Subjects
chemistry.chemical_classification ,Work (thermodynamics) ,Phase transition ,Materials science ,Bistability ,business.industry ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Dielectric ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Phosphate ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Nonlinear optical ,chemistry ,Materials Chemistry ,Optoelectronics ,Thermal stability ,0210 nano-technology ,business ,Inorganic compound - Abstract
Bistable compounds have attracted intensive interest because of their great potential to realize seamless integration of multifunctional switches in one device. However, previous studies are mainly limited to organic–inorganic hybrid compounds, which have relatively low phase-transition temperature and thermal stability. Here, we report a new pure inorganic compound CsCdPO4, which undergoes a high-temperature phase transition at 447 K. Correspondingly, CsCdPO4 simultaneously shows an interesting duple bistability of nonlinear optical and dielectric properties. Furthermore, it shows an extremely high thermal stability up to 1418 K, which is significantly higher than those of organic–inorganic bistable compounds. This work will open up a new avenue to develop multifunctional materials that remain stable even under extreme operating conditions (e.g. extremes of temperature). more...
- Published
- 2018
- Full Text
- View/download PDF
164. A general strategy for tailoring upconversion luminescence in lanthanide-doped inorganic nanocrystals through local structure engineering
- Author
-
Pengfei Peng, Huhui Fu, Yongsheng Liu, Maochun Hong, Renfu Li, Xueyuan Chen, Caiping Liu, and Feilong Jiang
- Subjects
Lanthanide ,Zirconium ,Materials science ,Upconversion luminescence ,Doping ,chemistry.chemical_element ,02 engineering and technology ,Crystal structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Photon upconversion ,0104 chemical sciences ,Ion ,Nanocrystal ,chemistry ,Physical chemistry ,General Materials Science ,0210 nano-technology - Abstract
A local structure around lanthanide (Ln3+) emitters in Ln3+-doped upconversion nanocrystals (UCNCs) is of fundamental importance in tailoring their upconversion luminescence (UCL) features. However, a general strategy responsible for the local-structure-dependent UCL in Ln3+-doped UCNCs has not been conclusively established to date. Herein, we report a new class of alkaline zirconium fluoride-based Yb3+/Er3+ co-doped UCNCs featuring a diversity of crystallographic structures for Ln3+ ion doping, which thereby allow us to thoroughly understand the origin underlying the local-structure-dependent UCL of the Er3+ ion for the first time. We reveal that the high-symmetry crystal lattice of Yb3+/Er3+ co-doped UCNCs may incur the large UCL red-to-green intensity ratio of Er3+ regardless of their identical elemental compositions. In combination with the first-principles calculations, we show that such local-structure-dependent UCL of Er3+ is primarily due to the varied electronic band structures induced by the Yb3+/Er3+ doping in different crystallographic structures of alkaline zirconium fluorides. These findings may open up a new avenue for constructing high-quality UCNCs with a tailored UCL profile and lifetime for diverse applications. more...
- Published
- 2018
- Full Text
- View/download PDF
165. Sustained Antitumor Immunity Based on Persistent Luminescence Nanoparticles for Cancer Immunotherapy
- Author
-
Liang Song, Xiaolong Liu, Maochun Hong, Ruoping Wang, Shenghui Zheng, Yun Zhang, and Junpeng Shi
- Subjects
Biomaterials ,Materials science ,Persistent luminescence ,Cancer immunotherapy ,Antitumor immunity ,Immune checkpoint inhibitors ,medicine.medical_treatment ,Electrochemistry ,Cancer research ,medicine ,Immunogenic cell death ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials - Published
- 2021
- Full Text
- View/download PDF
166. Iodide-Centered Cuprous Octatomic Ring: A Luminescent Molecular Thermometer Exhibiting Dual-Emission Character
- Author
-
Wen-Ting Deng, Fu-Ling Liu, Maochun Hong, Jun Tao, and Cheng-Yang Yue
- Subjects
chemistry.chemical_classification ,Materials science ,Dual emission ,Iodide ,02 engineering and technology ,General Chemistry ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,chemistry ,Thermometer ,General Materials Science ,0210 nano-technology ,Luminescence - Abstract
Luminescent molecular thermometers have attracted great attention due to their potential application for temperature detection in special environments. By a very simple one-step method, we have synthesized one novel cuprous compound, [I@Cu8(HMTZ)(MTZ)7]·MeCN·2H2O (I@Cu8), which consists of an infrequent octatomic [I@Cu8S8] ring. Importantly, compound I@Cu8 features dual-emitting behavior and shows successive visual luminescent emissions varying from green, to yellow, to orange, and then to red in the temperature range of 80–300 K, suggesting potential application for a luminescent molecular thermometer. more...
- Published
- 2017
- Full Text
- View/download PDF
167. Control the Structure of Zr-Tetracarboxylate Frameworks through Steric Tuning
- Author
-
Caiping Liu, Maochun Hong, Shuai Yuan, Christina T. Lollar, Hong-Cai Zhou, Daqiang Yuan, Jiandong Pang, Mingyan Wu, and Jun-Sheng Qin
- Subjects
Steric effects ,Stereochemistry ,Ligand ,Chemistry ,Structure (category theory) ,Structural diversity ,Molecular simulation ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,Computational chemistry ,0210 nano-technology ,Conformational isomerism - Abstract
Ligands with flexible conformations add to the structural diversity of metal-organic frameworks but, at the same time, pose a challenge to structural design and prediction. Representative examples include Zr-tetracarboxylate-based MOFs, which afford assorted structures for a wide range of applications, but also complicate the structural control. Herein, we systematically studied the formation mechanism of a series of (4,8)-connected Zr-tetracarboxylate-based MOFs by altering the substituents on different positions of the organic linkers. Different ligand rotamers give rise to three types of structures with flu, scu, and csq topologies. A combination of experiment and molecular simulation indicate that the steric hindrance of the substituents at different positions dictates the resulting MOF structures. Additionally, the controllable formation of different structures was successfully implemented by a combination of linkers with different steric effects at specific positions. more...
- Published
- 2017
- Full Text
- View/download PDF
168. Unusual Long-Range Ordering Incommensurate Structural Modulations in an Organic Molecular Ferroelectric
- Author
-
Junhua Luo, Jian Li, Maochun Hong, Chengmin Ji, Junliang Sun, and Zhihua Sun
- Subjects
Condensed matter physics ,Chemistry ,02 engineering and technology ,General Chemistry ,Dielectric ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Superspace ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Dipole ,Colloid and Surface Chemistry ,Aperiodic graph ,Lattice (order) ,Modulation (music) ,Wave vector ,0210 nano-technology - Abstract
The incommensurate (IC) behaviors of ferroelectrics have been widely investigated in inorganic oxides as an exciting branch for aperiodic materials, whereas it still remains a great challenge to achieve such intriguing effects in organic systems. Here, we present that successive ordering of dynamic dipoles in an organic molecular ferroelectric, N-isopropylbenzylaminium trichloroacetate (1), enables unusual incommensurately modulated structures between its paraelectric phase and ferroelectric phase. In particular, 1 exhibits three distinct IC states coupling with a long-range ordering modulation. That is, the incommensurately modulated lattice is ∼7 times as large as its periodic prototype, and the IC structure is well solved using a (3 + 1)D superspace group with the modulated wavevector q = (0, 0, 0.1589). To the best of our knowledge, 1 is the first organic ferroelectric showing such a long-range ordering IC structural modulation. In addition, structural analyses reveal that slowing down dynamic motions of anionic moieties accounts for its modulation behaviors, which also results in dramatic reorientation of dipolar moments and concrete ferroelectric polarization of 1 (∼0.65 μC/cm more...
- Published
- 2017
- Full Text
- View/download PDF
169. Flexible Zirconium MOFs as Bromine-Nanocontainers for Bromination Reactions under Ambient Conditions
- Author
-
Jiandong Pang, Shuai Yuan, Maochun Hong, Hong-Cai Zhou, Daqiang Yuan, Dong-Ying Du, Christina T. Lollar, Mingyan Wu, and Liangliang Zhang
- Subjects
Zirconium ,Bromine ,010405 organic chemistry ,Inorganic chemistry ,chemistry.chemical_element ,Halide ,Halogenation ,General Medicine ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Catalysis ,Structural transformation ,0104 chemical sciences ,Adsorption ,chemistry ,Metal-organic framework ,Chemical stability ,0210 nano-technology - Abstract
A series of flexible MOFs (PCN-605, PCN-606, and PCN-700) are synthesized and applied to reversible bromine encapsulation and release. The chemical stability of these Zr-MOFs ensures the framework's integrity during the bromine adsorption, while the framework's flexibility allows for structural adaptation upon bromine uptake to afford stronger host-guest interactions and therefore higher bromine adsorption capacities. The flexible MOFs act as bromine-nanocontainers which elongate the storage time of volatile halides under ambient conditions. Furthermore, the bromine pre-adsorbed flexible MOFs can be used as generic bromine sources for bromination reactions giving improved yields and selectivities under ambient conditions when compared with liquid bromine. more...
- Published
- 2017
- Full Text
- View/download PDF
170. Cation-Induced Strategy toward an Hourglass-Shaped Cu6I7– Cluster and Its Color-Tunable Luminescence
- Author
-
Cai Sun, Xingjun Li, Maochun Hong, Muxin Yu, Caiping Liu, Kang Zhou, Yan Yang, Feilong Jiang, and Lian Chen
- Subjects
010405 organic chemistry ,Chemistry ,business.industry ,General Chemical Engineering ,Analytical chemistry ,Phosphor ,General Chemistry ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,law.invention ,Monovalent Cations ,law ,Materials Chemistry ,Cluster (physics) ,Optoelectronics ,Quantum efficiency ,Hourglass ,Luminescence ,business ,Diode ,Light-emitting diode - Abstract
We have designed and synthesized a series of two-dimensional materials featuring with a (3,6)-connected kgd layer, in which an unprecedented anionic Cu6I7– cluster was first trapped through a cation-induced synthetic strategy. The emission colors of these cluster-based luminophores gradually shift from blue to yellow as the monovalent cations (Li+, Na+, NH4+, K+, TEA+) located between the neighboring layers changed. SCXRD analyses discover that the variation of the emission may be attributed to the transformation of the hourglass-shaped Cu6I7– cluster. The bright, tunable, and broad luminescent emissions make them promising candidates as phosphors for light-emitting diodes (LEDs). Particularly, compound 1-TEA emitting intensive yellow light with high luminescence quantum efficiency (QY = 79.9%) shows extremely high thermal, pH, organic solvent, and mechanical photostabilities. By employing it as a yellow phosphor, we fabricate a series of white lighting materials with high color rendering index (CRI). more...
- Published
- 2017
- Full Text
- View/download PDF
171. Tailored Engineering of an Unusual (C4 H9 NH3 )2 (CH3 NH3 )2 Pb3 Br10 Two-Dimensional Multilayered Perovskite Ferroelectric for a High-Performance Photodetector
- Author
-
Chengmin Ji, Sasa Wang, Zhihua Sun, Lina Li, Junhua Luo, Weida Hu, Maochun Hong, and Peng Wang
- Subjects
Materials science ,Photodetector ,Nanotechnology ,General Chemistry ,02 engineering and technology ,General Medicine ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Ferroelectricity ,01 natural sciences ,Catalysis ,0104 chemical sciences ,0210 nano-technology ,Perovskite (structure) - Abstract
Two-dimensional (2D) layered hybrid perovskites have shown great potential in optoelectronics, owing to their unique physical attributes. However, 2D hybrid perovskite ferroelectrics remain rare. The first hybrid ferroelectric with unusual 2D multilayered perovskite framework, (C4H9NH3)2(CH3NH3)2Pb3Br10 (1), has been constructed by tailored alloying of the mixed organic cations into 3D prototype of CH3NH3PbBr3. Ferroelectricity is created through molecular reorientation and synergic ordering of organic moieties, which are unprecedented for the known 2D multilayered hybrid perovskites. Single-crystal photodetectors of 1 exhibit fascinating performances, including extremely low dark currents (ca. 10−12 A), large on/off current ratios (ca. 2.5×103), and very fast response rate (ca. 150 μs). These merits are superior to integrated detectors of other 2D perovskites, and compete with the most active CH3NH3PbI3. more...
- Published
- 2017
- Full Text
- View/download PDF
172. Stabilizing Cesium Lead Halide Perovskite Lattice through Mn(II) Substitution for Air-Stable Light-Emitting Diodes
- Author
-
Maochun Hong, Xueyuan Chen, Caiping Liu, Rui Feng, Haibo Zeng, Feilong Jiang, Jianhai Li, Jizhong Song, Yongsheng Liu, Shenghan Zou, and Yongxiang Li
- Subjects
Photoluminescence ,Chemistry ,Inorganic chemistry ,chemistry.chemical_element ,Halide ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Catalysis ,0104 chemical sciences ,law.invention ,Colloid and Surface Chemistry ,law ,Quantum dot ,Chemical physics ,Caesium ,Lattice (order) ,Thermal stability ,0210 nano-technology ,Light-emitting diode ,Diode - Abstract
All-inorganic cesium lead halide perovskite (CsPbX3, X = Cl, Br, and I) quantum dots (QDs), possessing high photoluminescence quantum yields and tunable color output, have recently been endowed great promise for high-performance solar cells and light-emitting diodes (LEDs). Although moisture stability has been greatly improved through separating QDs with a SiO2 shell, the practical applications of CsPbX3 QDs are severely restricted by their poor thermal stability, which is associated with the intrinsically low formation energies of perovskite lattices. In this regard, enhancing the formation energies of perovskite lattices of CsPbX3 QDs holds great promise in getting to the root of their poor thermal stability, which hitherto remains untouched. Herein, we demonstrate an effective strategy through Mn2+ substitution to fundamentally stabilize perovskite lattices of CsPbX3 QDs even at high temperatures up to 200 °C under ambient air conditions. We employ first-principle calculations to confirm that the signi... more...
- Published
- 2017
- Full Text
- View/download PDF
173. Bandgap Narrowing of Lead-Free Perovskite-Type Hybrids for Visible-Light-Absorbing Ferroelectric Semiconductors
- Author
-
Maochun Hong, Zhihua Sun, Chengmin Ji, Jing Zhang, Sijie Liu, Junhua Luo, and Aurang Zeb
- Subjects
Materials science ,business.industry ,Photodetector ,Context (language use) ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Ferroelectricity ,0104 chemical sciences ,Crystal ,Photovoltaics ,Bandgap narrowing ,Optoelectronics ,General Materials Science ,Physical and Theoretical Chemistry ,0210 nano-technology ,business ,Visible spectrum ,Perovskite (structure) - Abstract
Perovskite-type hybrids (e.g., CH3NH3PbI3) hold great promise in photovoltaics and optoelectronics due to their remarkable semiconducting properties and potential ferroelectricity. However, to date, conclusive evidence for the bulk ferroelectricity of CH3NH3PbI3 is still lacking. In this context, it is highly desirable to assemble concrete perovskite ferroelectric hybrids with the semiconducting feature. Here we report, for the first time, a class of lead-free perovskite halides, (N-methylpyrrolidinium)3Sb2Cl9–9xBr9x (x = 0–1), showing large ferroelectric polarizations (5.2–7.6 μC/cm2) and pronounced semiconducting performances. In particular, a wide tunability of their optical bandgaps (3.31–2.76 eV) enables superior visible-light-induced photocurrents (∼10 nA/cm2), which allow for assembling of the crystal-based photodetectors. Our work paves a new way to build environmentally benign optoelectronic devices based on low-bandgap ferroelectric hybrids. more...
- Published
- 2017
- Full Text
- View/download PDF
174. Enhancing CO2 electrolysis through synergistic control of non-stoichiometry and doping to tune cathode surface structures
- Author
-
Ping Huang, Lingting Ye, Minyi Zhang, Kui Xie, Guo-Cong Guo, Maochun Hong, Chunsen Li, John T. S. Irvine, EPSRC, The Royal Society, University of St Andrews. School of Chemistry, and University of St Andrews. EaSTCHEM more...
- Subjects
Materials science ,Science ,Oxide ,General Physics and Astronomy ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,7. Clean energy ,Redox ,E-NDAS ,General Biochemistry, Genetics and Molecular Biology ,Article ,law.invention ,chemistry.chemical_compound ,Adsorption ,law ,QD ,SDG 7 - Affordable and Clean Energy ,Electrolysis ,Multidisciplinary ,Dopant ,Doping ,General Chemistry ,021001 nanoscience & nanotechnology ,QD Chemistry ,Cathode ,0104 chemical sciences ,Chemical state ,chemistry ,Chemical engineering ,0210 nano-technology - Abstract
Sustainable future energy scenarios require significant efficiency improvements in both electricity generation and storage. High-temperature solid oxide cells, and in particular carbon dioxide electrolysers, afford chemical storage of available electricity that can both stabilize and extend the utilization of renewables. Here we present a double doping strategy to facilitate CO2 reduction at perovskite titanate cathode surfaces, promoting adsorption/activation by making use of redox active dopants such as Mn linked to oxygen vacancies and dopants such as Ni that afford metal nanoparticle exsolution. Combined experimental characterization and first-principle calculations reveal that the adsorbed and activated CO2 adopts an intermediate chemical state between a carbon dioxide molecule and a carbonate ion. The dual doping strategy provides optimal performance with no degradation being observed after 100 h of high-temperature operation and 10 redox cycles, suggesting a reliable cathode material for CO2 electrolysis., Carbon dioxide electrolysers are promising for chemical storage of renewable electricity; however, achieving effective adsorption/activation of CO2 is still an issue. Here the authors make a perovskite titanate cathode where non-stoichiometry and chemical doping are used to tune the surface structures, facilitating CO2 reduction. more...
- Published
- 2017
175. [(N-AEPz)ZnCl
- Author
-
Xinyuan, Zhang, Lina, Li, Sasa, Wang, Xitao, Liu, Yunpeng, Yao, Yu, Peng, Maochun, Hong, and Junhua, Luo
- Abstract
Benefiting from their structural flexibility and solution processability, organic-inorganic metal halide hybrids with efficient white-light emission present a great promise for solid-state lighting and display applications. However, most of these reported high-performance single-component white-light materials contain lead. Herein, we report a "green" organic zinc halide, [(N-AEPz)ZnCl more...
- Published
- 2020
176. An Exceptional Peroxide Birefringent Material Resulting from d-π Interactions
- Author
-
Sangen Zhao, Yanqiang Li, Xiaomeng Liu, Junhua Luo, Shuai Liu, Zheshuai Lin, Qingran Ding, Lina Li, Maochun Hong, and Youchao Liu
- Subjects
Birefringence ,Materials science ,010405 organic chemistry ,Vanadium ,chemistry.chemical_element ,General Chemistry ,General Medicine ,010402 general chemistry ,Peroxide ,01 natural sciences ,Catalysis ,Rubidium ,0104 chemical sciences ,chemistry.chemical_compound ,Atomic orbital ,chemistry ,Chemical physics ,Anisotropy - Abstract
Birefringent materials, which can modulate the polarization of light, are almost exclusively limited to oxides. Peroxides have long been overlooked as birefringent materials, because they are usually not stable in air. Now, the first peroxide birefringent material Rb2 VO(O2 )2 F is reported, the single crystals of which keep transparency after being exposed in the air for two weeks. Interestingly, Rb2 VO(O2 )2 F does not feature an optimal anisotropic structure, but its birefringence (Δn=0.189 at 546 nm) exceeds those of the majority of oxides. According to the first-principles calculations, this exceptional birefringence should be attributed to the strong electronic interactions between localized π orbital of O22- anions and V5+ 3d orbitals, which may be also favorable to the stability in the air for Rb2 VO(O2 )2 F. These findings distinguish peroxides as a brand-new class of birefringent materials that may possess birefringence superior to the traditional oxides. more...
- Published
- 2020
177. Key Factors Controlling the Large Second Harmonic Generation in Nonlinear Optical Materials
- Author
-
Maochun Hong, Shuiquan Deng, Zhenhua Li, Xiyue Cheng, Myung-Hwan Whangbo, and Xin-Tao Wu
- Subjects
animal structures ,Materials science ,010405 organic chemistry ,Band gap ,Second-harmonic generation ,Primitive cell ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Ion ,Metal ,Covalent bond ,Chemical physics ,visual_art ,Atom ,visual_art.visual_art_medium ,General Materials Science ,Density functional theory - Abstract
The second harmonic generation (SHG) responses of nonisostructural nonlinear optical (NLO) compounds, β-BaB2O4, LiB3O5, CsB3O5, CsLiB6O10, KBe2BO3F2, and LiCs2PO4, were examined by density functional theory (DFT) calculations, and the contributions of their individual cations and anions were determined by performing atomic response theory analyses. In all of these compounds, the contribution of all metal cations lies in the range of ∼9.3 to ∼29.7% of the total SHG responses, and that of all anions lies between ∼57.4 and ∼72.3%. However, in terms of individual atom contribution, a large metal cation can contribute more than does an anion to the total SHG response. Our work shows that the SHG contribution of an individual anion (e.g., O2-) is weakened when it forms covalent bonds with its surrounding cations (e.g., O-B). The contribution of an individual cation is further affected by the homogeneity of its surrounding anion distribution and also by how strongly the polarizabilities of its surrounding anions are weakened by covalent bonding with other cations. The SHG response increases with αsum/(NEg), an important parameter useful in searching for new NLO materials, where αsum is the sum of the polarizabilities of all of the ions in the primitive unit cell, N is the total number of atoms per primitive cell, and Eg is the band gap. more...
- Published
- 2020
178. A Potential Sn-Based Hybrid Perovskite Ferroelectric Semiconductor
- Author
-
Chengmin Ji, Lina Li, Xinyuan Zhang, Zhihua Sun, Sangen Zhao, Junhua Luo, Chao He, Maochun Hong, Xitao Liu, and Sasa Wang
- Subjects
Phase transition ,Chemistry ,business.industry ,Energy conversion efficiency ,Photodetector ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,Semiconductor ,Optoelectronics ,business ,Semiconduction ,Excitation ,Perovskite (structure) - Abstract
Ferroelectric semiconductors, combining semiconduction, spontaneous polarization, and photoinduced excitation, show great promise to enhance the performance of solar cells, pressure sensors, and photodetectors. Particularly, organic-inorganic lead halide perovskite ferroelectrics have been explored for their prominent carrier transport properties and structural tunability. However, a high concentration of toxic Pb is a stumbling block for their further application. Here, we present a lead-free hybrid perovskite semiconductor, (C4H9NH3)2(NH3CH3)2Sn3Br10 (1), which exhibits a large spontaneous polarization of 11.76 μC cm-2 at room temperature. Significantly, 1 presents a spontaneous polar ordering transition, similar to the better-known perovskite ferroelectrics, and exhibits ferroelectric phase transition behaviors. To our best knowledge, 1 is the first example of a Sn-based hybrid perovskite semiconductor featuring ferroelectric performance. Mechanistic studies reveal that such ferroelectricity can be attributable to the synergistic effects of ordering of organic cations and stereochemically active lone-pair electrons inducing distortion of inorganic octahedra. This work provides an effective way to explore "green" ferroelectric semiconductors with potentially enhanced energy conversion efficiency. more...
- Published
- 2020
179. Halide Double Perovskite Ferroelectrics
- Author
-
Junhua Luo, Maochun Hong, and Weichuan Zhang
- Subjects
Materials science ,010405 organic chemistry ,Band gap ,business.industry ,Intercalation (chemistry) ,chemistry.chemical_element ,Halide ,General Medicine ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Bismuth ,Semiconductor ,chemistry ,Optoelectronics ,Chemical stability ,business ,Perovskite (structure) - Abstract
Halide double perovskites have recently emerged as a promising environmentally friendly optoelectronic and photovoltaic material for their inherent thermodynamic stability, high defect tolerance, and appropriate band gaps. However, to date, no ferroelectric material based on halide double perovskites has been discovered. Herein, by hetero-substitution of lead and cation intercalation of n-propylamine, the first halide double perovskite ferroelectric, (n-propylammonium)2 CsAgBiBr7 (1), is reported and it exhibits distinct ferroelectricity with a notable saturation polarization of about 1.5 μC cm-2 . More importantly, single-crystal photodetectors of 1 exhibit extraordinary performance with containing high on/off ratios of about 104 , fast response rates of 141 μs, and detectivity as high as 5.3×1011 Jones. This finding opens a new way to design high-performance perovskite ferroelectrics, and provides a viable approach in the search for stable and lead-free optoelectronic materials as an alternative to the lead-containing system. more...
- Published
- 2019
180. Trilayered Lead Chloride Perovskite Ferroelectric Affording Self-Powered Visible-Blind Ultraviolet Photodetection with Large Zero-Bias Photocurrent
- Author
-
Sasa Wang, Wenxiong Lin, Maochun Hong, Wen Weng, Xitao Liu, Zhihua Sun, Lina Li, Junhua Luo, and Chengmin Ji
- Subjects
Photocurrent ,Chemistry ,business.industry ,Lead chloride ,General Chemistry ,Photodetection ,010402 general chemistry ,medicine.disease_cause ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Colloid and Surface Chemistry ,medicine ,Optoelectronics ,Charge carrier ,Zero bias ,business ,Ultraviolet ,Perovskite (structure) - Abstract
Perovskite ferroelectrics, in which the spontaneous polarization (Ps) is conducive to the separation of photoexcited charge carriers, have shown great potential for self-powered photodetection. Nev... more...
- Published
- 2019
181. Multilayered 2D Cesium-Based Hybrid Perovskite with Strong Polarization Sensitivity: Dimensional Reduction of CsPbBr
- Author
-
Yi, Liu, Jiaqi, Wang, Shiguo, Han, Xitao, Liu, Maofan, Li, Zhiyun, Xu, Wuqian, Guo, Maochun, Hong, Junhua, Luo, and Zhihua, Sun
- Abstract
3D perovskite CsPbBr
- Published
- 2019
182. High-Temperature Antiferroelectric of Lead Iodide Hybrid Perovskites
- Author
-
Yi Liu, Xitao Liu, Maochun Hong, Junhua Luo, Zhiyun Xu, Yaobin Li, Zhihua Sun, and Shiguo Han
- Subjects
chemistry.chemical_classification ,Range (particle radiation) ,Field (physics) ,Chemistry ,Iodide ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,Energy storage ,0104 chemical sciences ,Dipole ,Hysteresis ,Colloid and Surface Chemistry ,Chemical physics ,Antiferroelectricity - Abstract
Antiferroelectrics, characterized by the natural polarization-electric field (P-E) double hysteresis loops, has been developed as a promising branch for energy storage. Here, we present the first antiferroelectric in the booming family of lead iodide hybrid perovskites, (BA)2(EA)2Pb3I10 (1, where BA = n-butylammonium and EA = ethylammonium), which exhibits one of the highest Curie temperatures (∼363 K) for the majority of known molecular systems. Strikingly, its high-temperature antiferroelectricity, triggered by an antipolar alignment of adjacent dipoles, is confirmed by the characteristic double P-E hysteresis loops, thus enabling remarkable energy storage efficiencies in the range of 65%-83%. This merit is almost comparable to those of many inorganic counterparts, suggesting the great potential of 1 for energy storage. Another fascinating attribute is that 1 also acts as a room-temperature biaxial ferroelectric with spontaneous polarization of 5.6 μC·cm-2. As far as we know, this study on the high-temperature antiferroelectric, along with room-temperature biaxial ferroelectricity, is unprecedented for the versatile lead iodide hybrid perovskites, which sheds light on the design of new electric-ordered materials and facilitates their application of high-performance devices. more...
- Published
- 2019
183. Azobenzene Decorated NbO-Type Metal-Organic Framework for High-Capacity Storage of Energy Gases
- Author
-
Pan Huang, Maochun Hong, Jiandong Pang, Feilong Jiang, Cheng Chen, Zixiao Hong, and Mingyan Wu
- Subjects
010405 organic chemistry ,Ligand ,Chemistry ,High capacity ,Microporous material ,engineering.material ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Type metal ,Azobenzene ,Chemical engineering ,engineering ,Carboxylate ,Physical and Theoretical Chemistry ,Natural bond orbital - Abstract
Herein, a microporous NbO-type framwork (FJI-H23) that showed outstanding surface area (3740.4 m2·g–1) was fabricated by utilizing an azobenzene-derived carboxylate ligand. As anticipated, FJI-H23 ... more...
- Published
- 2019
184. An Unprecedented Biaxial Trilayered Hybrid Perovskite Ferroelectric with Directionally Tunable Photovoltaic Effects
- Author
-
Lina Li, Zhihua Sun, Chengmin Ji, Sasa Wang, Xitao Liu, Junhua Luo, Zhenyue Wu, and Maochun Hong
- Subjects
Chemistry ,business.industry ,Photovoltaic system ,Poling ,General Chemistry ,Anomalous photovoltaic effect ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Ferroelectricity ,Catalysis ,0104 chemical sciences ,Spontaneous polarization ,Colloid and Surface Chemistry ,Curie temperature ,Optoelectronics ,Symmetry breaking ,Polarization (electrochemistry) ,business - Abstract
Multiaxial molecular ferroelectrics, in which multiple-directional switching of spontaneous polarization creates diverse properties, have shown many intriguing advantages, making them indispensable complements to conventional inorganic oxides. Despite recent blooming advances, multiaxial molecular ferroelectric with bulk photovoltaic effects still remains a huge blank. Herein, we report a biaxial lead halide ferroelectric, EA4Pb3Br10 (1, EA = ethylammonium), which adopts the unique trilayered perovskite motif with a high Curie temperature of ∼384 K. Particularly, for 1, the distinct symmetry breaking with 4/ mmmF mm2 species leads to the emergence of four equivalent polarization directions in the ferroelectric phase. Based on its biaxial nature, the bulk photovoltaic effect of 1 can be facilely tuned between such multiple directions through electric poling. As far as we know, this is the first report on biaxial hybrid perovskite ferroelectric showing directionally tunable photovoltaic activity. This work provides an avenue to control the bulk physical properties of multiaxial molecular ferroelectrics, and highlights their potential for further applications in the field of smart devices. more...
- Published
- 2019
185. An indium-organic framework for the efficient storage of light hydrocarbons and selective removal of organic dyes
- Author
-
Mingyan Wu, Maochun Hong, Pan Huang, Cheng Chen, and Feilong Jiang
- Subjects
010405 organic chemistry ,Ligand ,Inorganic chemistry ,Cationic polymerization ,chemistry.chemical_element ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,High uptake ,Light hydrocarbons ,Inorganic Chemistry ,chemistry.chemical_compound ,Adsorption ,Microcrystalline ,chemistry ,Indium ,Methylene blue - Abstract
Herein, an anionic indium-organic framework, FJI-H21, was successfully prepared using an azobenzene-derivated tetra-carboxylate ligand, which had well-shaped honeycomb-like hexagonal channels along the crystallographic b-axis and trapezoidal window-like one-dimensional channels along the crystallographic c-axis. Due to its intrinsic microporosity, FJI-H21 demonstrated highly selective storage of C2-C3 hydrocarbons over CH4 under ambient conditions; furthermore, the selectivities for equimolar light hydrocarbons/CH4, estimated by the ideal adsorbed solution theory (IAST), indicated that FJI-H21 could efficiently separate C2-C3 hydrocarbons from CH4. However, FJI-H21 could also selectively adsorb cationic dyes, such as methylene blue (MB), ethyl violet (EV) and cation red (GTL) from anionic or neutral dyes with high uptake, rapid adsorption rate, and good recyclability; especially, using microcrystalline materials developed by fast synthesis, the adsorption rate for cationic dyes was significantly improved by 100-fold as compared to that of block crystals. The abovementioned results indicate that the sizes of the samples have an important influence on their adsorption performance. more...
- Published
- 2019
186. A Flexible Two-Fold Interpenetrated Indium MOF Exhibiting Dynamic Response to Gas Adsorption and High-Sensitivity Detection of Nitroaromatic Explosives
- Author
-
Lian Chen, Muxin Yu, Shengchang Li, Zhen Cao, Kang Zhou, Caiping Liu, Maochun Hong, Zhijia Li, and Feilong Jiang
- Subjects
010405 organic chemistry ,Chemistry ,Organic Chemistry ,Inorganic chemistry ,chemistry.chemical_element ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Adsorption ,Nitroaromatic explosives ,Metal-organic framework ,Indium - Abstract
A flexible two-fold interpenetrated indium metal-organic framework InOF-23, featuring one-dimensional micro-sized channels decorated by exposed N groups, was successfully synthesized. Interestingly, InOF-23 displays unique dynamic responses to different gases (N2 , Ar, and CO2 ) at low and room temperatures, which indicates that it can be a good candidate for gas adsorption and separation. Furthermore, the high efficiency detection for p-nitroaniline (pNA) makes InOF-23 a potential chemosensor for nitroaromatic explosives. more...
- Published
- 2019
187. Chiral induction in a pcu-derived network from achiral precursors
- Author
-
Dong Wu, Qihui Chen, Hui Xue, Luyao Liu, Maochun Hong, Feilong Jiang, Jian Zhang, Zixiao Hong, Daqiang Yuan, and Kang Zhou
- Subjects
Quantitative Biology::Biomolecules ,010405 organic chemistry ,Ligand ,Chemistry ,High Energy Physics::Lattice ,High Energy Physics::Phenomenology ,Metals and Alloys ,General Chemistry ,010402 general chemistry ,01 natural sciences ,Combinatorial chemistry ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Condensed Matter::Soft Condensed Matter ,Materials Chemistry ,Ceramics and Composites ,Chirality (chemistry) ,Topology (chemistry) ,Chiral induction - Abstract
Rational induction of chirality from achiral systems is one of the most compelling challenges for chemists. Herein, the first chiral net derived from pcu topology has been prepared using the vertex splitting and ligand anchoring strategy, showing a new way to construct chiral frameworks from achiral precursors. more...
- Published
- 2019
188. Constructing All‐Inorganic Perovskite/Fluoride Nanocomposites for Efficient and Ultra‐Stable Perovskite Solar Cells
- Author
-
Yongsheng Liu, Dapeng Yu, Maochun Hong, Qing Zhao, Feilong Jiang, Yao Zhao, Zhaoyu Wang, Youchao Wei, and Caiping Liu
- Subjects
Biomaterials ,chemistry.chemical_compound ,Nanocomposite ,Photoluminescence ,Materials science ,chemistry ,Chemical engineering ,Electrochemistry ,Condensed Matter Physics ,Fluoride ,Electronic, Optical and Magnetic Materials ,Perovskite (structure) - Published
- 2021
- Full Text
- View/download PDF
189. Unconventional inorganic precursors determine the growth of metal-organic frameworks
- Author
-
Junyang Ding, Jinjie Qian, Li Zhong, and Maochun Hong
- Subjects
Reaction conditions ,010405 organic chemistry ,Chemistry ,fungi ,Nanotechnology ,Context (language use) ,010402 general chemistry ,01 natural sciences ,0104 chemical sciences ,Inorganic Chemistry ,Preparation method ,Template ,Homogeneous ,Materials Chemistry ,Metal-organic framework ,Physical and Theoretical Chemistry ,Hybrid material - Abstract
Crystalline metal-organic frameworks (MOFs) are an emerging type of the hybrid materials with multifunctional inorganic and organic building blocks, which have been applied in a wide range of energy-related and environment-related applications. In this context, a remaining challenge in the systematical syntheses of hierarchically porous MOFs composites is existing to alter supermolecular structure, chemical composition, and versatile functionality. It is generally accepted that the regulation of MOF preparation is of great significance, which is related to the solubility of those starting inorganic components. We learn that there are several possible drawbacks induced by conventional soluble metal precursors in homogeneous reaction conditions, so the increasing research interest in the facile synthesis of MOFs and their derivatives from insoluble metal templates and/or precursors has been ignited in the past decade. In this review, we aim to provide an overview of the facile preparation and usage of MOF materials by using the unconventional inorganic precursors in heterogeneous synthetic conditions, including template types, preparation methods, extension strategies, advantages, limitations and related applications. more...
- Published
- 2021
- Full Text
- View/download PDF
190. Study on polyurethane‐acrylate/cerium dioxide modified by 3‐(Methylacryloxyl)propyltrimethoxy silane and its <scp>UV</scp> absorption property
- Author
-
Qihui Chen, Heqing Fu, Xiaochen Yu, Maochun Hong, Jia Zheng, and Zhaoxi Zhou
- Subjects
Acrylate ,Materials science ,Polymers and Plastics ,Uv absorption ,chemistry.chemical_element ,General Chemistry ,Silane ,Surfaces, Coatings and Films ,chemistry.chemical_compound ,Cerium ,chemistry ,Chemical engineering ,Materials Chemistry ,Copolymer ,Polyurethane - Published
- 2021
- Full Text
- View/download PDF
191. Mixed-Lanthanide Metal–Organic Frameworks with Tunable Color and White Light Emission
- Author
-
Chengyuan Zhu, Maochun Hong, Yanli Gai, Xin Li, Qin Guo, Qing Huang, Rui Yao, Feilong Jiang, Yan Chen, Ke-Cai Xiong, and Chenyuan Li
- Subjects
Lanthanide ,Excitation wavelength ,Materials science ,Ligand ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,White light ,General Materials Science ,Metal-organic framework ,Isostructural ,0210 nano-technology ,Luminescence - Abstract
Three isostructural lanthanide metal–organic frameworks (Ln-MOFs, Ln = Eu3+, Tb3+, Dy3+) containing P-terphenyl-2,2″,4,4″-tetracarboxylate ligand (H4L) with red, green, and blue luminescence were solvothermally synthesized. Thus, a series of mixed Ln-MOFs, (EuxTbyDy1-x-y)(HL)(H2O)(DEF) (DEF, N,N-diethylformamide), were designed and obtained, which displayed highly temperature-tuned emission in the visible region, including white light emission. Additionally, tunable luminescence can also be achieved by changing the excitation wavelength. more...
- Published
- 2017
- Full Text
- View/download PDF
192. Fabricating a super stable luminescent chemosensor with multi-stimuli-response to metal ions and small organic molecules through turn-on and turn-off effects
- Author
-
Maochun Hong, Muxin Yu, Yan Yang, Feilong Jiang, Xiuyan Wan, Zhen Cao, Jing Tan, and Lian Chen
- Subjects
Materials science ,Metal ions in aqueous solution ,Inorganic chemistry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Ion ,Solvent ,Turn (biochemistry) ,chemistry.chemical_compound ,chemistry ,Materials Chemistry ,Molecule ,Methanol ,Diethyl ether ,0210 nano-technology ,Luminescence - Abstract
A luminescent Ln-MOF (1) with a combination of exceptionally high thermal, air and chemical stabilities has been synthesized. The multi-stimuli-responsive luminescence of 1 makes it a multifunctional chemosensor for metal ions and small organic molecules, which can selectively detect Cd2+/Mn2+ ions as well as methanol/diethyl ether solvent molecules through turn-on/turn-off effects. Compound 1 can also be utilized as a luminescent probe for diethyl ether vapor and the material can be conveniently reactivated for regeneration. more...
- Published
- 2017
- Full Text
- View/download PDF
193. A semi-conductive organic–inorganic hybrid emits pure white light with an ultrahigh color rendering index
- Author
-
Sijie Liu, Aurang Zeb, Chengmin Ji, Zhenyue Wu, Maochun Hong, Junhua Luo, Zhihua Sun, Sangen Zhao, Sasa Wang, and Lina Li
- Subjects
Materials science ,business.industry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,Color rendering index ,Semiconductor ,law ,Organic inorganic ,Materials Chemistry ,White light ,Optoelectronics ,Organic component ,Chromaticity ,0210 nano-technology ,business ,Electrical conductor ,Light-emitting diode - Abstract
White-light emission has evoked great attention as one of the most promising technologies in the applications of solid-state lighting devices, light emitting diodes, and flat-panel displays. However, up to now, pure white-light emitting materials have rarely been reported. Here, we present a single-component white-light emitting semiconductor, [C5H9–NH3]4CdBr6, which exhibits CIE chromaticity coordinates of (0.33, 0.33). Notably, this value is the same as that of the standard pure white-light emission. Remarkably, it shows an ultrahigh color rendering index of 92.5, which exceeds that of mixed-phosphor light sources and is comparable to the recently reported highest one among single-component materials. Mechanistic studies indicate that the white-light emission originates from the synergetic effect of deep defects coupled with the organic component. Such an organic–inorganic hybrid with outstanding color characteristics will pave a new approach in the development of white-light emitting materials with practical applications. more...
- Published
- 2017
- Full Text
- View/download PDF
194. A monomeric bowl-like pyrogallol[4]arene Ti12 coordination complex
- Author
-
Mingyan Wu, Daqiang Yuan, Wenjing Wang, Maochun Hong, Yan-Xi Tan, and Kongzhao Su
- Subjects
chemistry.chemical_classification ,010405 organic chemistry ,Metals and Alloys ,chemistry.chemical_element ,General Chemistry ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Coordination complex ,chemistry.chemical_compound ,Monomer ,chemistry ,Pyrogallol ,Materials Chemistry ,Ceramics and Composites ,Methylene blue ,Titanium - Abstract
Herein, an unprecedented monomeric bowl-like coordination complex, Ti12PgC3 (PgC3 = C-propylpyrogallol[4]arene), has been successfully synthesized. To the best of our knowledge, Ti12PgC3 not only presents the first pyrogallol[4]arene-based titanium coordination complex, but also the highest nuclearity titanium coordination complex in the metal–calixarene system. In addition, this titanium coordination complex can effectively degrade the methylene blue (MB) dye under sunlight. more...
- Published
- 2017
- Full Text
- View/download PDF
195. A family of doped lanthanide metal–organic frameworks for wide-range temperature sensing and tunable white light emission
- Author
-
Feilong Jiang, Lian Chen, Bo Zhang, Xiuyan Wan, Yan Yang, Muxin Yu, and Maochun Hong
- Subjects
Lanthanide ,Chemical substance ,Materials science ,Doping ,Analytical chemistry ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Ion ,Wavelength ,Materials Chemistry ,0210 nano-technology ,Luminescence ,Ternary operation - Abstract
A family of lanthanide MOFs (LnL) with high thermal and air stability have been successfully synthesized. Based on this robust framework, a series of binary and ternary co-doped LnMOFs, EuxTbyL (y = 1−x) and EuxTbyGd1−x−yL, are achieved for use as ratiometric temperature sensors and white-light-emitting materials. In a binary co-doped system, Eu0.0066Tb0.9934L and Eu0.0089Tb0.9911L show good linear responses to temperature with high sensitivities over a very wide range (from 77 K to 450 K), of which Eu0.0066Tb0.9934L exhibits a maximum relative sensitivity (Sm) of 3.76% K−1 at 450 K. This value is comparable to those of other excellent LnMOF thermometers reported recently whereas the response temperature range is greatly enlarged. The ternary mixed LnMOFs based on energy transfer of different lanthanide ions as ratiometric luminescent thermometers are firstly investigated, in which Eu0.013Tb0.060Gd0.927L displays an extremely high sensitivity (Sm = 6.11% K−1), representing one of the largest values reported so far in mixed LnMOFs. Furthermore, by virtue of carefully adjusting the composition of the mixed LnMOFs and the wavelength of excitation, the emission color can be systematically modulated and a tunable white light emission material, Eu0.0062Tb0.0087Gd0.9851L, is successfully developed. more...
- Published
- 2017
- Full Text
- View/download PDF
196. Cooperation of Three Chromophores Generates the Water-Resistant Nitrate Nonlinear Optical Material Bi3TeO6OH(NO3)2
- Author
-
Sangen Zhao, Chengmin Ji, Yaoguo Shen, Bingqing Zhao, Junhua Luo, Yi Yang, Lina Li, Maochun Hong, Zheshuai Lin, Zhenyue Wu, and Daqiang Yuan
- Subjects
Water resistant ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Crystal structure ,Electron ,Chromophore ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,Nitrate ,chemistry ,Octahedron ,Chemical physics ,Molecule ,0210 nano-technology ,Lone pair - Abstract
Nitrates have long been ignored for practical uses as nonlinear optical (NLO) materials because they are usually very easy to dissolve in water; despite this, the π-conjugated [NO3]− is among the most desirable NLO-active structural units. The cooperation of three structural chromophores, namely, Bi3O6OH short chains with 6s2 lone pair electrons, distorted TeO6 octahedra with d10 electrons, and π-conjugated [NO3]− triangles, generates a new nitrate NLO material, Bi3TeO6OH(NO3)2, which exhibits an enhanced phase-matchable NLO response of three times that of KH2PO4 (3×KH2PO4), exceeding those of most nitrate NLO materials. Remarkably, the new material did not show obvious weight loss and degeneration of NLO response after being dipped in de-ionized water for 24 h, indicating that it is highly resistant to water. Theoretical calculations reveal that foreign water molecules cannot stably stay in the crystal lattice of Bi3TeO6OH(NO3)2. These findings highlight the introduction of diverse chromophores into the nitrate systems as an effective approach for developing practical nitrate NLO materials that are of high water-resistance and good optical performance. more...
- Published
- 2016
- Full Text
- View/download PDF
197. Strong Nonlinear-Optical Response in the Pyrophosphate CsLiCdP2O7 with a Short Cutoff Edge
- Author
-
Sangen Zhao, Zhihua Sun, Lina Li, Junhua Luo, Chengmin Ji, Maochun Hong, Yaoguo Shen, and Bingqing Zhao
- Subjects
business.industry ,Inorganic chemistry ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Alkali metal ,Phosphate ,medicine.disease_cause ,01 natural sciences ,Pyrophosphate ,0104 chemical sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Transition metal ,Caesium ,medicine ,Optoelectronics ,Cutoff ,Electron configuration ,Physical and Theoretical Chemistry ,0210 nano-technology ,business ,Ultraviolet - Abstract
A high efficiency of laser-light conversion and short cutoff edge is essential to an ultraviolet (UV) nonlinear-optical (NLO) material. Previous researches on phosphates were mainly centered on alkali-metal or alkali-earth-metal phosphate systems, resulting in relatively weak NLO responses. Through the introduction of transition-metal cadmium and alkali-metal cesium elements with large radii into the phosphate system, a new UV NLO pyrophosphate, CsLiCdP2O7, has been synthesized. It exhibits a high second-harmonic-generation (SHG) efficiency of 1.5KH2PO4 and is transparent down to 200 nm. This work provides a new path for the design of UV NLO materials with high SHG efficiencies and short cutoff edges by introducing a transition metal with a d10 electron configuration and an alkali metal with a large radius into phosphate systems. more...
- Published
- 2016
- Full Text
- View/download PDF
198. Deep-Ultraviolet Transparent Cs2LiPO4 Exhibits an Unprecedented Second Harmonic Generation
- Author
-
Zheshuai Lin, Chengmin Ji, Yang Yang, Yaoguo Shen, Bingqing Zhao, Maochun Hong, Junhua Luo, Lina Li, Sangen Zhao, and Ping Fu
- Subjects
Materials science ,business.industry ,General Chemical Engineering ,Second-harmonic generation ,02 engineering and technology ,General Chemistry ,Crystal structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,medicine.disease_cause ,01 natural sciences ,0104 chemical sciences ,Nonlinear optical ,Optics ,Congruent melting ,Materials Chemistry ,medicine ,Optoelectronics ,0210 nano-technology ,business ,Ultraviolet ,Topology (chemistry) - Abstract
Developing superior deep-ultraviolet (deep-UV) nonlinear optical (NLO) materials is a great challenge because of the contradiction between deep-UV transparency and enhanced second harmonic generation (SHG), especially for deep-UV NLO phosphates in which the constituent P–O groups have relatively small microscopic SHG coefficients. Here we report a new noncentrosymmetric phosphate Cs2LiPO4 (I), whose crystal structure consists of [LiPO4]∞ layered structural units with a novel honeycomb-like topology. As compared with the benchmark deep-UV NLO material KBe2BO3F2, I is beryllium-free, and it is relatively easy to grow its large single crystals because of its congruent melting. Furthermore, it not only is deep-UV transparent but also exhibits an unexpectedly enhanced SHG response of 1.8 × KH2PO4 that hits a new high in deep-UV NLO phosphates. These results demonstrate that I satisfies the key requirements of being a promising deep-UV NLO candidate. Theory calculations and structural analysis reveal that the e... more...
- Published
- 2016
- Full Text
- View/download PDF
199. Conformation Improving Construction of Ag3L2 Metallocages and Their Selective Encapsulation
- Author
-
Luyao Liu, Feilong Jiang, Linfeng Liang, Guangxun Lyu, Hui Xue, Qihui Chen, Daqiang Yuan, and Maochun Hong
- Subjects
010405 organic chemistry ,Chemistry ,Tripodal ligand ,General Materials Science ,General Chemistry ,010402 general chemistry ,Condensed Matter Physics ,01 natural sciences ,Combinatorial chemistry ,Conformational isomerism ,0104 chemical sciences ,Encapsulation (networking) - Abstract
A novel tripodal ligand L that only has a syn conformer has been designed and synthesized. Different Ag3L2 metallocages can be effectively assembled from such concave ligands and different Ag(I) salts. ESI-MS research indicates that a Ag3L2 metallocage can encapsulate different anions selectively, in which the encapsulation capacity is as follows: NO3– > ClO4– > SO42–; moreover, selective encapsulation of NO3– from a mixture of NO3– and ClO4– has been observed. more...
- Published
- 2016
- Full Text
- View/download PDF
200. Fabrication and thermal stability of two-dimensional carbide Ti3C2 nanosheets
- Author
-
Youfu Zhou, Kun Wang, Decai Huang, Zhiguang Wang, Wentao Xu, and Maochun Hong
- Subjects
Anatase ,Materials science ,Fabrication ,Process Chemistry and Technology ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Exfoliation joint ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Carbide ,Chemical engineering ,Etching (microfabrication) ,Materials Chemistry ,Ceramics and Composites ,Thermal stability ,MAX phases ,0210 nano-technology ,Solid solution - Abstract
Two-dimensional Ti3C2 nanosheets were obtained by exfoliation of synthesized Ti3AlC2 powders in 40% HF solution at room temperature. The influence of etching time on the synthesis, structural evolution during heating, and thermal stability of as-prepared Ti3C2 nanosheets were studied. The graphene-like structure of as-prepared Ti3C2 nanosheets was confirmed by XRD and SEM. TG–DTA and elemental analysis suggested that the OH and F groups attached on the surface of Ti3C2 nanosheets could be eliminated by heat treatment. It is noteworthy that Ti3C2 nanosheets are thermal stable up to 1200 °C in Ar atmosphere. In the heating process, a small quantity of TiO2 anatase emerges at 500 °C and then reacts with Ti3C2 to form a solid solution of TiCxO1−x (0 more...
- Published
- 2016
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.