13 results on '"Hongpan Rong"'
Search Results
2. Size-controlled synthesis of Fe3O4 and Fe3O4@SiO2 nanoparticles and their superparamagnetic properties tailoring
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Muhammad Sajid, Sidra Shuja, Hongpan Rong, and Jiatao Zhang
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General Materials Science - Published
- 2023
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3. Synthetic strategies of supported atomic clusters for heterogeneous catalysis
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Shufang Ji, Hongpan Rong, Yadong Li, Dingsheng Wang, and Jiatao Zhang
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inorganic chemicals ,Materials science ,Catalyst synthesis ,Science ,General Physics and Astronomy ,Nanoparticle ,Nanotechnology ,02 engineering and technology ,Review Article ,010402 general chemistry ,Heterogeneous catalysis ,01 natural sciences ,General Biochemistry, Genetics and Molecular Biology ,Catalysis ,Atom ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,lcsh:Science ,Condensed Matter::Quantum Gases ,Multidisciplinary ,Synthesis and processing ,General Chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,lcsh:Q ,0210 nano-technology - Abstract
Supported atomic clusters with uniform metal sites and definite low-nuclearity are intermediate states between single-atom catalysts (SACs) and nanoparticles in size. Benefiting from the presence of metal–metal bonds, supported atomic clusters can trigger synergistic effects among every metal atom, which contributes to achieving unique catalytic properties different from SACs and nanoparticles. However, the scalable and precise synthesis and atomic-level insights into the structure–properties relationship of supported atomic clusters is a great challenge. This perspective presents the latest progress of the synthesis of supported atomic clusters, highlights how the structure affects catalytic properties, and discusses the limitations as well as prospects., Supported atomic clusters with precise nuclearity are intermediate states between single-atom catalysts and nanoparticles in size. Here the authors summarize and discuss synthetic strategies of supported atomic clusters with unique catalytic properties for heterogeneous reactions.
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- 2020
4. Unique Cation Exchange in Nanocrystal Matrix via Surface Vacancy Engineering Overcoming Chemical Kinetic Energy Barriers
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Jia Liu, Meng Xu, Hailong Chen, Sergio Brovelli, Chongyang Zhao, Hongpan Rong, Jiajia Liu, Bing Bai, Yijie Du, Wenxing Chen, Jiatao Zhang, Yuxiang Weng, Jiabi Ma, Bai, B, Zhao, C, Xu, M, Ma, J, Du, Y, Chen, H, Liu, J, Rong, H, Chen, W, Weng, Y, Brovelli, S, and Zhang, J
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Materials science ,General Chemical Engineering ,Biochemistry (medical) ,Doping ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Kinetic energy ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Nanomaterials ,Matrix (mathematics) ,Nanocrystal ,colloidal nanocrystals, surface defect engineering, doped quantum dots, cation exchange, kinetic energy barriers ,Chemical physics ,Vacancy defect ,Materials Chemistry ,Environmental Chemistry ,Spontaneous emission ,0210 nano-technology ,Ternary operation - Abstract
Summary Surface vacancy engineering played a significant role in tailoring the structure and improving the performance of semiconductor nanocrystals (SNCs). Developing controllable vacancy engineering strategies to overcome kinetic energy barriers in multi-step reactions is anticipated to explore further synthesis mechanisms and functional nanomaterials. Herein, we exploited an effective surface-vacancy-engineering-initialized cation exchange (SVEICE) strategy to realize energy-unfavored cation exchange reactions from ternary CuInX2 (X = S, Se) to Cu, In dual-doped binary CdX, or ZnX SNCs, unprecedentedly. The sequential and selective creation of Cu and In vacancies on multi-component SNC surface is critical to break through kinetic energy barriers. The emission of dual-doped CdS:Cu/In SNCs crossed visible-NIR region due to the radiative transition from doped In level to Cu-doped e- or t-level, and the radiative recombination process could also be tailored by this strategy. Further energy analysis and experiments confirmed its versatility.
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- 2020
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5. Micro-scale 2D quasi-nanosheets formed by 0D nanocrystals: from single to multicomponent building blocks
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Rongrong Pan, Liu Huang, Wenxing Chen, Jiajia Liu, Jia Liu, Jiatao Zhang, Hongpan Rong, Meng Xu, and Yu Chang
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Materials science ,Superlattice ,Stacking ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Solvent ,Colloid ,Nanocrystal ,Monolayer ,General Materials Science ,Self-assembly ,0210 nano-technology ,Plasmon - Abstract
Self-assembly of colloidal nanocrystals (NCs) into large-scale superlattices with complex and controllable structures has attracted extensive attention due to their collective properties and promising device applications. Plasmonic NCs are very popular for long-range ordered superstructures by virtue of their collective nanogaps for electromagnetic field enhancement, in particular bulk-scale single-layer assembly. Large-area two-dimensional (2D) quasinanosheets (QNSs) composed of mono-component Au NCs or multi-component Au@ZnS core-shell hetero-nanocrystals (HNCs) were successfully prepared, via careful solvent evaporation-induced interfacial self-assembly. The entire self-assembly process was carried out on the liquid-air surface and mediated simply by tuning the operating temperatures and concentrations of the NCs. Specifically, monolayer and double-layer 2D QNSs in tens of micrometers scale with different stacking models were fabricated by precisely controlling the solvent evaporation rate and colloidal concentration.
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- 2020
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6. Modulating the local coordination environment of single-atom catalysts for enhanced catalytic performance
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Xinyuan Li, Jiatao Zhang, Dingsheng Wang, Yadong Li, and Hongpan Rong
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inorganic chemicals ,Materials science ,Coordination number ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Catalysis ,Atom ,General Materials Science ,Electrical and Electronic Engineering ,0210 nano-technology - Abstract
The local coordination environment of catalysts has been investigated for an extended period to obtain enhanced catalytic performance. Especially with the advancement of single-atom catalysts (SACs), research on the coordination environment has been advanced to the atomic level. The surrounding coordination atoms of central metal atoms play important roles in their catalytic activity, selectivity and stability. In recent years, remarkable improvements of the catalytic performance of SACs have been achieved by the tailoring of coordination atoms, coordination numbers and second- or higher-coordination shells, which provided new opportunities for the further development of SACs. In this review, the characterization of coordination environment, tailoring of the local coordination environment, and their related adjustable catalytic performance will be discussed. We hope this review will provide new insights on further research of SACs.
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- 2020
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7. Cation/Anion Exchange Reactions toward the Syntheses of Upgraded Nanostructures: Principles and Applications
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Jia Liu, Jing Wei, Hongbo Li, Hongzhi Wang, Wenxing Chen, Caizhen Zhu, Jiatao Zhang, Hongpan Rong, Muwei Ji, Xinyuan Li, Jiajia Liu, Meng Xu, and Jin Wang
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Materials science ,Photoluminescence ,Nanostructure ,Nanocrystal ,Band gap ,Quantum dot ,Doping ,General Materials Science ,Nanotechnology ,Crystal engineering ,Perovskite (structure) - Abstract
Summary The last 5 years have witnessed rapid progress in the field of hybrid nanostructures toward enhanced optical and electronic properties. On this topic, we focus on the relevant progress that has been achieved on the basis of cation/anion exchange reactions (CERs/AERs). Different from those direct synthesis strategies, CERs/AERs can offer more freedom in tuning the chemical composition, crystal phases, doping, interfaces, and morphologies, which are key parameters to determine the optical and electronic properties of the target products. We present several examples, e.g., doped quantum dots (QDs), engineered core-shell QDs, metal-semiconductor hybrid nanostructures, hollow structures, and inorganic perovskite nanocrystals. These upgraded structures afforded by CERs/AERs generally exhibit improved properties, such as increased quantum yields, prolonged lifetimes, and well-engineered band gaps for charge transportation and recombination, thus providing more opportunities for further advanced applications.
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- 2020
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8. Facet engineering in metal organic frameworks to improve their electrochemical activity for water oxidation
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Hongpan Rong, Sheng Guan, Dingsheng Wang, Jiawei Wan, Yadong Li, Di Liu, Hai Xiao, and Feng Xie
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Facet (geometry) ,Materials science ,Metals and Alloys ,Oxygen evolution ,General Chemistry ,Electrochemistry ,Catalysis ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Nanocrystal ,Imidazolate ,Materials Chemistry ,Ceramics and Composites ,Metal-organic framework - Abstract
The facet effect has been well demonstrated for nanocrystal catalysis, however it is rarely revealed in metal organic frameworks (MOFs). Herein, we present a facile way to construct 2D zeolitic imidazolate framework-67 (ZIF-67) with dominant exposure of the (002) facets. We discovered that the ZIF-67 (002) facet exhibited the highest catalytic activity for oxygen evolution reaction (OER) among the (002), (011), and (111) facets. Moreover, this facet engineering is also available for ZIF-8 nanocrystals.
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- 2020
9. Enhancement of the complex third-order nonlinear optical susceptibility in Au nanorods
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Masanobu Naito, Joel Henzie, Yoshihiko Takeda, Rodrigo Sato, and Hongpan Rong
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Materials science ,Condensed matter physics ,business.industry ,Nanophotonics ,02 engineering and technology ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Wavelength ,Optics ,Attenuation coefficient ,0103 physical sciences ,Nanorod ,0210 nano-technology ,business ,Local field ,Optical susceptibility ,Refractive index ,Plasmon - Abstract
We experimentally determined the dispersion of the complex third-order nonlinear optical susceptibility χ(3) of Au nanorods over a wide bandwidth (370 – 800 nm). Compared to bulk Au, these nanorods exhibit greatly enhanced nonlinearities that can be manipulated by geometrical parameters. Accurately measuring the χ(3) values of nanostructured metals is challenging because χ(3) is strongly influenced by the local field effects. Hence the current published χ(3) values for Au nanorods have huge variations in both magnitude and sign because Z-scan measurements are used almost exclusively. This work combines pump-probe methods with spectroscopic ellipsometry to show that Au nanorods exhibit strong wavelength dependence and enhanced χ(3) in the vicinity of the longitudinal plasmon mode and explains where the regions of SA and RSA exist and how focusing and defocusing affects χ(3). In this context, the results highlight the importance of the dispersion of the quantity χ(3) to design plasmonic platforms for nanophotonics applications.
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- 2019
10. Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange for near-infrared photodetectors
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Stephen V. Kershaw, Xiaodong Wan, Meng Xu, Wenxing Chen, Liming Xie, Jiatao Zhang, Muwei Ji, Muhammad Ahsan Iqbal, Sarah J. Haigh, Yi-Chi Wang, Andrey L. Rogach, Hongpan Rong, Hongzhi Wang, Jiajia Liu, Jia Liu, Xinyuan Li, and Thomas J. A. Slater
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Materials science ,Analytical chemistry ,Shell (structure) ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,Crystallinity ,chemistry.chemical_compound ,National Graphene Institute ,law ,Telluride ,Phase (matter) ,General Materials Science ,Electrical and Electronic Engineering ,Cation exchange synthesis ,Renewable Energy, Sustainability and the Environment ,Graphene ,Near-infrared photodetector ,Crystal phase engineering ,021001 nanoscience & nanotechnology ,Cadmium telluride photovoltaics ,0104 chemical sciences ,Amorphous solid ,chemistry ,ResearchInstitutes_Networks_Beacons/national_graphene_institute ,Nanorod ,Core/shell nanorods ,0210 nano-technology - Abstract
We have explored the synthesis of Au@HgxCd1-xTe core@shell nanorods by sequential aqueous cation exchange (ACE) for near-infrared photodetector application. A number of related Au@telluride core/shell nanorod structures were put forwarded, taking advantage of multi-step transformations through a binary and then a ternary phase for the telluride shells. The latter have a high degree of crystallinity thanks to the step-wise ACE method. The use of only trace amounts of Cd2+ coordinated with tri-n-butylphosphine, assisted the phase transformation from an amorphous Ag2Te shell to a highly crystalline Ag3AuTe2 shell in the first stage; this was followed by a further cation exchange (CE) step with far higher Cd2+ levels to fabricate a highly crystalline CdTe shell, and with an additional CE with Hg2+ to convert it to a HgxCd1-xTe shell. The composition of the shell components and the well-controlled thickness of the shells enabled tunable surface plasmon resonance properties of the Au@telluride nanorods in the NIR region. Utilizing the enhanced NIR absorption, a hybrid photodetector structure of Au@HgxCd1-xTe nanorods on graphene was fabricated, showing visible to NIR (vis-NIR) broadband detection with high photoresponsivity (~106 A/W).
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- 2019
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11. Noble Metal-Based Nanocomposites for Fuel Cells
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JiataoZhang, Hongpan Rong, Sajid Muhammad, and Shuping Zhang
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Nanocomposite ,Materials science ,02 engineering and technology ,engineering.material ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Chemical engineering ,engineering ,Fuel cells ,Noble metal ,0210 nano-technology ,GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries) - Published
- 2018
12. Recent Advances in Platinum-based Intermetallic Nanocrystals: Controlled Synthesis and Electrocatalytic Applications
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Jiatao Zhang, Dingsheng Wang, Tianyi Yang, Hongpan Rong, and Cheng Cui
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Materials science ,Nanocrystal ,chemistry ,Intermetallic ,chemistry.chemical_element ,Nanotechnology ,Physical and Theoretical Chemistry ,Platinum - Published
- 2020
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13. Ultrathin rhodium nanosheets
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Han-Shi Hu, Chun-Ran Chang, Yadong Li, Paul J. Dyson, Haohong Duan, Hiroyuki Asakura, Junjie Mao, Tsunehiro Tanaka, Jun Li, Hongpan Rong, Rong Yu, Zhiqiang Niu, Ning Yan, and Gang Zhou
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Multidisciplinary ,Materials science ,Graphene ,General Physics and Astronomy ,chemistry.chemical_element ,Nanotechnology ,General Chemistry ,General Biochemistry, Genetics and Molecular Biology ,Rhodium ,law.invention ,Metal ,chemistry ,law ,visual_art ,visual_art.visual_art_medium - Abstract
Despite significant advances in the fabrication and applications of graphene-like materials, it remains a challenge to prepare single-layered metallic materials, which have great potential applications in physics, chemistry and material science. Here we report the fabrication of poly(vinylpyrrolidone)-supported single-layered rhodium nanosheets using a facile solvothermal method. Atomic force microscope shows that the thickness of a rhodium nanosheet is
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- 2014
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