35 results on '"Yongqian Gao"'
Search Results
2. Synthesis of 42-faceted bismuth vanadate microcrystals for enhanced photocatalytic activity
- Author
-
Gang Lu, Zichen Lu, Zhuoyao Li, Xiao Huang, Hiroshi Uji-i, Yongqian Gao, Xueting Zhai, Guilin Wang, Wei Huang, and Ping Li
- Subjects
Materials science ,Oxide ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Biomaterials ,Metal ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,Chemical engineering ,visual_art ,Bismuth vanadate ,visual_art.visual_art_medium ,Rhodamine B ,Photocatalysis ,Molecule ,0210 nano-technology - Abstract
Bismuth vanadate (BiVO4) microcrystals enclosed with up to 42 low and high index facets were synthesized through truncation of BiVO4 octahedral crystals via a simple and highly reproducible hydrothermal method. The size and shape of the truncated BiVO4 crystals could be tuned by varying the acid concentration, reaction temperature and reaction period. Compared to the BiVO4 octahedral crystals without truncation, the 42-faceted ones showed an enhanced photocatalytic activity in the degradation of rhodamine B molecules due to the enhanced charge separation on the exposed low and high index facets. This was confirmed at sub-particle level by the photo-deposition of gold and manganese oxide nanoparticles selectively on hot electron and hole accumulated facets, respectively. Our results will provide a guideline for the synthesis of more efficient BiVO4 and many other multinary metal oxide-based photocatalysts. Moreover, the synthesized microcrystals are perfect materials for the study of photocatalytic property of BiVO4 at single and sub-particle level.
- Published
- 2019
3. Supramolecular Design of Donor–Acceptor Complexes via Heteroatom Replacement toward Structure and Electrical Transporting Property Tailoring
- Author
-
Guankui Long, Haixiao Xu, Caixia Zhu, Jianfeng Zhao, Jing Zhang, Mingtao Zhang, Wei Huang, Yongqian Gao, Jianqun Jin, and Changjin Ou
- Subjects
Steric effects ,Materials science ,010405 organic chemistry ,Heteroatom ,Supramolecular chemistry ,Chemical modification ,010402 general chemistry ,Ring (chemistry) ,01 natural sciences ,Acceptor ,Electron transport chain ,0104 chemical sciences ,Crystallography ,Molecule ,General Materials Science - Abstract
A feasible strategy relies on using heteroatom replacement, namely, chemical modification of an organic compound. Here we present this design concept for donor-acceptor complexes, which involves introducing nitrogen atoms to the middle ring of donor molecules to promote short contacts and reduce steric effect of the mixed framework. These nitrogen-modified complexes can possess a shorter molecular distance besides the mixed-stacking pathway, enlarged π-π interactions, or even a scarce 1:2.5 molar ratio through extra acceptor insertion. As a result, the unique 1:2 complex with nitrogen atoms on the different sides demonstrated stable electron field-effect mobility performance, whereas the binary system with no nitrogen replacement or N atoms on the identical sides displayed poor ambipolar properties. These results confirmed that heteroatom replacement was a powerful molecular design tool to fine-tune the molecular packing of organic donor-acceptor complexes and their corresponding electronic properties.
- Published
- 2018
4. The complete chloroplast genome of
- Author
-
Yongqian, Gao, Mei, Lv, Tao, Cui, and Xiaoli, Wan
- Subjects
Caryota obtusa ,phylogenetic analysis ,Chloroplast complete genome ,Arecaceae ,Mitogenome Announcement - Abstract
Caryota obtusa is an endangered and economically important species of the Arecaceae. The complete chloroplast genome sequence of this species is a circular molecule of 159,882 bp in size, including a pair of inverted repeats with length of 27,271 bp, separated by a large single-copy (87,645 bp) region and a small single-copy region (17,695 bp). In total, there are 131 genes, encoding 79 protein-coding genes, 40 tRNAs, and 10 rRNA genes, in which 123 genes, 69 CDSs, 37 tRNAs, and 10 rRNAs are unique, respectively. Phylogenetic inference confirmed the monophyly of the Caryota genus and its delimitation in subfamily Coryphoideae.
- Published
- 2020
5. Nitrile chain reactions for cyano-based ionic liquid derived mesoporous carbon as efficient bifunctional electrocatalyst
- Author
-
Mark H. Rümmeli, Ying-Bing Jiang, Guifu Zou, Yongqian Gao, Jie Zhao, Ying Su, Labao Zhang, and Hui Wang
- Subjects
Nitrile ,Chemistry ,General Chemical Engineering ,Oxygen evolution ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrocatalyst ,01 natural sciences ,0104 chemical sciences ,Catalysis ,chemistry.chemical_compound ,Specific surface area ,Polymer chemistry ,Ionic liquid ,Pyridine ,Electrochemistry ,0210 nano-technology ,Bifunctional - Abstract
Different from the intermediate nitrile cyclotrimerization reactions, a new nitrile chain reaction is proposed to interpret the condensation and carbonization process of cyano-based ionic liquids [MCNIm][TFSI] which is used as a model precursor. The nitrile chain reaction forms several oligomers including dimers, trimers and tetramers during the condensation process at low temperature. The results show the oligomers are pyrolyzed to small fragments at high temperature undergoing a variety of cross-linking and recombination to produce more stable benzene and pyridine based polycyclic aromatic groups prior to the final mesoporous carbon material formation. The cyano-based ionic liquids and nitrile chain reaction mechanism readily yields mesoporous carbon with a specific surface area of 1050 m2 g−1 and a high co-doping with N and S and a content of graphitized material. In terms of potential applications, the N, S-codoped mesoporous carbon material facilitates excellent bifunctional electrocatalytic activity toward the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) comparable to the benchmark of those commercial 20 wt% Pt/C and RuO2 catalysts, respectively. Remarkably, our analyses show bis(trifluoromethanesulphonyl)-imide (TFSI) anions display much better thermal stability than imidazolium cations, which suggests future potential for other functional cations with more thermally stable intermediate polymeric structures.
- Published
- 2018
6. An effective signal amplifying strategy for copper (II) sensing by using in situ fluorescent proteins as energy donor of FRET
- Author
-
Shiyu Zhang, Wei Huang, Jinhua Liu, Yongqian Gao, Zhongfu An, Xiaofei Qin, Lin Li, Chengwu Zhang, Qianchen Zhang, and Duoduo Zhao
- Subjects
In situ ,Serum albumin ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Signal ,Blood serum ,Materials Chemistry ,Electrical and Electronic Engineering ,Instrumentation ,Detection limit ,biology ,Metals and Alloys ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Fluorescence ,Copper ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Förster resonance energy transfer ,chemistry ,biology.protein ,Biophysics ,0210 nano-technology - Abstract
Fluorescence resonance energy transfer (FRET) is a reliable, sensitive, and robust assay method for detection of many biological targets. However, it generally needs an externally-introduced label to form the donor-acceptor pair, which could alter the accuracy of the detection. To address this issue, we report herein the FRET-based reactive copper ion sensors by using in situ fluorescent proteins (FP) of human urine or blood serum as the energy donor. Using Bull Serum Albumin (BSA) as model proteins, the sensor exhibits a remarkably fluorescence enhancement when BSA binds to the surface of copper clusters (Cu NCs) base on electrostatic interaction. Conversely, low fluorescence enhancement is observed without using BSA. As proof-of-principle, this positive approach is directly applied to detect Cu2+ using urine as the energy donor, accompanying with a signal enhancement by two factors and low detection limit of 0.5 μM Cu2+. Moreover, the proposed sensor could be applied in other complex environments, such as blood serum or cell culture medium. Consequently, the effectiveness, simplicity and diversity of our proposed strategy enable the development of a class of probes toward complex human environment for rapid, sensitive, and selective detection of targets.
- Published
- 2018
7. Surface-Oxidation-Controlled Synthesis of Blue Fluorescence Wavelength-Tunable Mini-Size Carbon Nitride Nanosheet and Its Application
- Author
-
Yongqian Gao, Yun Ni, Hai-Dong Yu, Lin Li, Wei Huang, Jixin Zhu, Shiyu Zhang, Chengwu Zhang, Jinhua Liu, and Qianchen Zhang
- Subjects
chemistry.chemical_compound ,Wavelength ,Materials science ,chemistry ,business.industry ,Optoelectronics ,General Chemistry ,Surface oxidation ,business ,Carbon nitride ,Fluorescence ,Nanosheet - Published
- 2018
8. A flexible SERS-active film for studying the effect of non-metallic nanostructures on Raman enhancement
- Author
-
Xiao Huang, Renji Bian, Dongyu Cai, Gang Lu, Xueting Zhai, Hai Li, Wei Huang, Ronghua Yi, Yongqian Gao, Juqing Liu, and Guilin Wang
- Subjects
Pore size ,Nanostructure ,Materials science ,Polydimethylsiloxane ,Metallic nanostructures ,Composite number ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,symbols.namesake ,chemistry ,symbols ,General Materials Science ,0210 nano-technology ,Raman spectroscopy ,Raman scattering ,Visible spectrum - Abstract
Since the discovery of surface enhanced Raman scattering (SERS), the choice of SERS-active materials has been limited mainly to metals, especially gold and silver in the visible spectrum. Although non-metals can also be SERS-active by forming nanostructures or composite structures with SERS-active materials, the mechanism behind it is still unclear and there is no perfect technique to study it. In this work, by constructing a SERS structure on a flexible polydimethylsiloxane film, we provide a way to study the effect of non-metallic nanostructures on Raman enhancement by attaching the above film onto flat and nanostructured surfaces. It was found that a nanoporous silicon surface contributes to an additional, up to five times, Raman enhancement. The pore depth and pore size also influence the observed Raman enhancement. These findings will help us not only to understand the mechanism of SERS involving non-metallic nanostructures, but also to design more efficient SERS structures for various applications.
- Published
- 2018
9. Significant enhancement of photovoltaic performance through introducing S⋯N conformational locks
- Author
-
Yusheng Chen, Yongqian Gao, Jianwei Yu, Pan Ye, Lei Yang, Shiming Zhang, Hui Huang, Jianfei Wu, and Simiao Yu
- Subjects
chemistry.chemical_classification ,Organic solar cell ,Renewable Energy, Sustainability and the Environment ,Photovoltaic system ,Nanotechnology ,02 engineering and technology ,General Chemistry ,Electron acceptor ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Acceptor ,Planarity testing ,0104 chemical sciences ,chemistry.chemical_compound ,chemistry ,General Materials Science ,0210 nano-technology ,Thiazole - Abstract
In this contribution, we developed a novel type of IDT-based small molecular acceptor, IDT-Tz, using thiazole as π-bridges. Through employing thiazole units as the π-bridges, nitrogen⋯sulfur noncovalent conformational locks were introduced to enhance the rigidity and planarity of the backbone, and thus reduce the reorganization energy, increase the charge transport mobility, and enhance the photovoltaic performance. The differences between the IDT-Tz and IDT-T based solar cells were fully investigated to understand the influences of the nitrogen⋯sulfur noncovalent conformational locks. The organic solar cells based on the IDT-Tz electron acceptor exhibit power conversion efficiencies (PCEs) as high as 8.4%, which is significantly higher than the PCE (4.1%) of the IDT-T based devices. This work demonstrated a novel strategy for enhancing the PCE of organic solar cells through introducing noncovalent conformational locks, which will be promising in designing novel high-performance non-fullerene materials.
- Published
- 2017
10. The complete chloroplast genome of Caryota obtusa, an endangered and economically important species
- Author
-
Mei Lv, Xiaoli Wan, Tao Cui, and Yongqian Gao
- Subjects
0106 biological sciences ,0301 basic medicine ,Whole genome sequencing ,biology ,Caryota obtusa ,Endangered species ,Arecaceae ,biology.organism_classification ,010603 evolutionary biology ,01 natural sciences ,Genome ,Chloroplast ,03 medical and health sciences ,030104 developmental biology ,Botany ,Genetics ,Molecular Biology - Abstract
Caryota obtusa is an endangered and economically important species of the Arecaceae. The complete chloroplast genome sequence of this species is a circular molecule of 159,882 bp in size, including...
- Published
- 2020
11. Silver Nanowire-Templated Molecular Nanopatterning and Nanoparticle Assembly for Surface-Enhanced Raman Scattering
- Author
-
Haifeng Yuan, Xiang Wang, Xiao Huang, Chengyu Zhang, Yongqian Gao, Cong Wei, Zhuoyao Li, Gang Lu, Hai Li, and Guilin Wang
- Subjects
molecular pattern ,nanopattern ,surface-enhanced Raman scattering ,NANOLITHOGRAPHY ,Chemistry, Multidisciplinary ,silane ,Nanoparticle ,Nanotechnology ,ARCHITECTURES ,Silver nanowires ,FILMS ,010402 general chemistry ,NANOSTRUCTURES ,01 natural sciences ,Catalysis ,chemistry.chemical_compound ,symbols.namesake ,Molecule ,Science & Technology ,010405 organic chemistry ,Chemistry ,silver nanowire ,NANOTECHNOLOGY ,Organic Chemistry ,General Chemistry ,Silane ,Small molecule ,0104 chemical sciences ,Template ,Physical Sciences ,symbols ,GRAPHENE OXIDE ,PHOTOLITHOGRAPHY ,Raman scattering - Abstract
Developing simple and cost-efficient methods for fabricating molecular patterns is of great importance in the field of nanoscience and nanotechnology. Here, a simple and convenient method was developed for fabricating nanopatterns composed of positively charged silane molecules by using silver nanowires as templates. The as-obtained silane pattern copies the shape of the silver nanowires and is only 0.7 nm thick, which can later be used for templated assembly of small molecules and nanoparticles of opposite charges. As a proof of concept, the resultant assembly could be further used for surface-enhanced Raman scattering. ispartof: CHEMISTRY-A EUROPEAN JOURNAL vol:25 issue:45 pages:10561-10565 ispartof: location:Germany status: published
- Published
- 2019
12. Spectroscopic and Intensity Modulated Photocurrent Imaging of Polymer/Fullerene Solar Cells
- Author
-
Yongqian Gao, Alan K. Thomas, Adam J. Wise, and John K. Grey
- Subjects
Photocurrent ,chemistry.chemical_classification ,Materials science ,Fullerene ,Analytical chemistry ,02 engineering and technology ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Miscibility ,Polymer solar cell ,0104 chemical sciences ,chemistry ,Phase (matter) ,General Materials Science ,0210 nano-technology ,Spectroscopy ,Excitation - Abstract
Molecular spectroscopic and intensity modulated photocurrent spectroscopy (IMPS) imaging techniques are used to map morphology-dependent charge recombination in organic polymer/fullerene solar cells. IMPS uses a small (∼10%) sinusoidal modulation of an excitation light source and photocurrent responses are measured while modulation frequencies are swept over several decades (∼1 Hz-20 kHz). Solar cells consisting of either poly(3-hexylthiophene) (P3HT) and poly(2-methoxy-5-(3'-7'-dimethyloctyloxy)-1,4-phenylenevinylene) (MDMO-PPV) blended with a soluble fullerene derivative, [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are used as targets. The morphologies of these polymer/fullerene systems are distinctly different due to PCBM miscibility in various polymer conformers. IMPS responses of both blend solar cells show unique morphology-dependent charge generation, transport and extraction signatures that can be spatially correlated to microscopic variations in local composition and packing by constructing IMPS images along with corresponding molecular spectroscopic imaging over the same scan area. We find that boundaries separating enriched polymer and fullerene domains promote nongeminate charge recombination appearing as positive phase shifts in the IMPS response. These zones are susceptible to degradation and we propose the approaches herein can be used to probe material and device degradation in situ under various conditions, such as oxygen content, temperature and ionizing radiation.
- Published
- 2015
13. Crystallization induced enantiomer division (CIED) of π-expanded benzoacridine regioisomers
- Author
-
Jiewei Li, Qiang Zhao, Yongqian Gao, Yang Yu, Zepeng Wang, Jiena Weng, Jinyi Lin, Jianfeng Wang, Bohan Yan, Yihao Li, Jianfeng Zhao, Wei Huang, and Xiang-Hua Zhao
- Subjects
Materials science ,Band gap ,Process Chemistry and Technology ,General Chemical Engineering ,Diastereomer ,02 engineering and technology ,Carbon-13 NMR ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,law.invention ,Crystallography ,law ,Intramolecular force ,Proton NMR ,Crystallization ,Enantiomer ,0210 nano-technology ,Single crystal - Abstract
Asymmetrical isomerization with prochiral π-distortion is useful to precisely construct nonplanar arenes as promising wide band gap (>2.2 eV) semiconductors. A series of asymmetrical benzoacridine regioisomers (ADs) were designed and obtained via a two-step procedure including Ullmann C-N coupling, intramolecular Friedel-Crafts ortho -aroylation. Interestingly, crystallization induced enantiomer division (CIED) of four prochiral ADs was observed. The corresponding ten divided enantiomers or diastereoisomers were carefully anatomized and distinguished from their “monozygotic and/or dizygotic twins” in crystals. The precise structures of four ADs were confirmed by 1 H NMR, 13 C NMR, HiRes MALDI-TOF MS, FT-IR and single crystal X-Ray diffraction. According to the absorbance spectra, ADs possess wide optical band gaps (2.90–2.98 eV) in film state and potential ability for high performed electronic devices.
- Published
- 2019
14. Corolla retention after pollination facilitates the development of fertilized ovules in Fritillaria delavayi (Liliaceae)
- Author
-
Fan Du, Changming Wang, Yongqian Gao, and Bo Song
- Subjects
0301 basic medicine ,China ,Pollination ,lcsh:Medicine ,Flowers ,Article ,03 medical and health sciences ,0302 clinical medicine ,Anthesis ,Pollinator ,lcsh:Science ,Ovule ,Transpiration ,Multidisciplinary ,biology ,Reproductive success ,Liliaceae ,Reproduction ,lcsh:R ,Temperature ,food and beverages ,biology.organism_classification ,Horticulture ,030104 developmental biology ,Fritillaria ,Fertilization ,Fruit ,Seeds ,Pollen ,lcsh:Q ,Respiration rate ,030217 neurology & neurosurgery - Abstract
Corollas (or perianths), considered to contribute to pollinator attraction during anthesis, persist after anthesis in many plants. However, their post-floral function has been little investigated within a cost-benefit framework. We explored the adaptive significance of corolla retention after anthesis for reproduction in Fritillaria delavayi, a perennial herb endemic to the alpine areas of the Hengduan Mountains, southwestern China. We examined whether the persistent corollas enhance reproductive success during seed development. Persistent corollas increased fruit temperature on sunny days, and greatly decreased the intensity of ultraviolet-B/C (UV-B/C) radiation reaching fruits. When corollas were removed immediately after pollination, fecundity and progeny quality were adversely affected. Measurements of flower mass and size showed no further corolla growth during fruiting, and respiration and transpiration tests demonstrated that both respiration rate and transpiration rate of corollas were much lower during fruiting than during flowering, indicating a slight additional resource investment in corolla retention after anthesis. Thus, seed production by F. delavayi may be facilitated by corolla retention during seed development at only a small physiological cost. We conclude that corolla retention may be an adaptive strategy that enhances female reproductive success by having a protective role for ripening seeds in the harsh conditions at high elevation.
- Published
- 2018
15. Layer-by-layer deposition of ultra-thin hybrid/microporous membrane for CO2 separation
- Author
-
Yongqian Gao, Yongming Tian, and Sivakumar Challa
- Subjects
Membrane ,Materials science ,Chemical engineering ,Layer by layer ,Microporous material - Published
- 2017
16. Hierarchically interconnected nitrogen-doped carbon nanosheets for an efficient hydrogen evolution reaction
- Author
-
Guifu Zou, Yongqian Gao, Yinghui Sun, Hui Wang, Tingting Liu, Lijun Gao, Ying-Bing Jiang, and Qinghua Yi
- Subjects
Tafel equation ,Materials science ,Doping ,chemistry.chemical_element ,Nanotechnology ,Nitrogen doped ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrocatalyst ,01 natural sciences ,0104 chemical sciences ,Catalysis ,Chemical engineering ,chemistry ,General Materials Science ,Hydrogen evolution ,0210 nano-technology ,Carbon ,Hydrogen production - Abstract
Exploring low-cost and efficient electrocatalysts based on earth-abundant elements for the hydrogen evolution reaction (HER) is of great importance for the development of clean and renewable energy. In this work, we report a facile self-foaming strategy for synthesis of hierarchically interconnected nitrogen-doped carbon nanosheets (NCNS). The doping N species within the 3D interconnected carbon network affords rich active sites for the HER and facilitates fast charge transfer. As a result, the NCNS exhibit excellent catalytic activity with an onset potential of −65 mV, and a Tafel slope of 81 mV dec−1 with robust stability over 10 h in acidic media. Further analyses suggest that the graphitic N species in the NCNS contribute to their catalytic activity. Such a high catalytic performance makes the NCNS a promising metal-free HER electrocatalyst for practical hydrogen production.
- Published
- 2017
17. Hybrid Graphene-Giant Nanocrystal Quantum Dot Assemblies with Highly Efficient Biexciton Emission
- Author
-
Jennifer A. Hollingsworth, Enkeleda Dervishi, Niladri S. Karan, Aditya D. Mohite, Oleksiy Roslyak, Stephen K. Doorn, Han Htoon, Gautam Gupta, Andrei Piryatinski, Chris J. Sheehan, Yongqian Gao, Feng Wang, Andrew M. Dattelbaum, and Yagnaseni Ghosh
- Subjects
Materials science ,Nanocrystal ,Graphene ,law ,Quantum dot ,Nanotechnology ,Atomic and Molecular Physics, and Optics ,Plasmon ,Biexciton ,Electronic, Optical and Magnetic Materials ,law.invention - Published
- 2014
18. Competition between Auger Recombination and Hot-Carrier Trapping in PL Intensity Fluctuations of Type II Nanocrystals
- Author
-
Xuedan Ma, Benjamin D. Mangum, Feng Wang, Han Htoon, Yongqian Gao, Allison M. Dennis, and Jennifer A. Hollingsworth
- Subjects
Luminescence ,Materials science ,Photoluminescence ,Phosphines ,Exciton ,Metal Nanoparticles ,Trapping ,Sulfides ,Indium ,Fluence ,Biomaterials ,symbols.namesake ,Quantum Dots ,Cadmium Compounds ,Nanotechnology ,General Materials Science ,Particle Size ,Selenium Compounds ,Photons ,Auger effect ,Temperature ,General Chemistry ,Nanocrystal ,Quantum dot ,symbols ,Lasers, Semiconductor ,Atomic physics ,Excitation ,Biotechnology - Abstract
Performing time-tagged, time-correlated, single-photon-counting studies on individual colloidal nanocrystal quantum dots (NQDs), the evolution of photoluminescence (PL) intensity-fluctuation behaviors in near-infrared (NIR) emitting type II, InP/CdS core-shell NQDs is investigated as a function of shell thickness. It is observed that Auger recombination and hot-carrier trapping compete in defining the PL intensity-fluctuation behavior for NQDs with thin shells, whereas the role of hot-carrier trapping dominates for NQDs with thick shells. These studies further reveal the distinct ramifications of altering either the excitation fluence or repetition rate. Specifically, an increase in laser pump fluence results in the creation of additional hot-carrier traps. Alternately, higher repetition rates cause a saturation in hot-carrier traps, thus activating Auger-related PL fluctuations. Furthermore, it is shown that Auger recombination of negatively charged excitons is suppressed more strongly than that of positively charged excitons because of the asymmetry in the electron-hole confinement in type II NQDs. Thus, this study provides new understanding of how both NQD structure (shell thickness and carrier-separation characteristics) and excitation conditions can be used to tune the PL stability, with important implications for room-temperature single-photon generation. Specifically, the first non-blinking NQD capable of single-photon emission in the near-infrared spectral regime is described.
- Published
- 2014
19. Effective Business Strategy for International Strategic Performance: An Empirical Study of Chinese Construction Firms
- Author
-
Yongqian Gao and Mirzaeva Dilafruz Faziljanovna
- Subjects
Strategic planning ,Knowledge management ,Strategic leadership ,business.industry ,Cost leadership ,Strategic alignment ,Strategic management ,Marketing ,Profit impact of marketing strategy ,business ,Business operations ,International business strategy - Abstract
To build on the research of strategic management we conducted an empirical study in the context of international performance. Three principal strategies, according to Porters generic strategy theory: cost leadership cost-focus and differentiation respectively, were tested in our research model. Quantitative empirical analysis of international strategy on a sample of 58 Chinese firms was conducted to determine strategies that lead to enhanced strategic performance. We utilized survey strategy encompassing questionnaire data collection. The collected data was analyzed using SPSS statistical package. Inference statistics consisting of correlation analysis and multiple regression analysis were performed. Findings of the study suggest that cost leadership and differentiation strategies impact strategic performance significantly, whereas cost-focus does not. A value of appropriate international business strategy is illustrated by supporting a relationship between strategy and international performance. The originality of contributions of the study lies in the fact that the generic business strategies’ impact on strategic performance is tested on an international market on the sample of Chinese firms. These notions enrich existing body of knowledge on strategic management. Therefore, companies conducting their business operations internationally should consider forming and implementing strategies of differentiation and cost leadership to achieve optimal business results.
- Published
- 2014
20. Adrenomedullin blockade suppresses sunitinib-resistant renal cell carcinoma growth by targeting the ERK/MAPK pathway
- Author
-
Qingsong Meng, Jianghua Jia, Shu-wen Yang, Ming Zhang, Wei Li, Dong-bin Wang, Jinyi Li, Xin Wang, Changbao Qu, Na Qiao, and Yongqian Gao
- Subjects
0301 basic medicine ,MAPK/ERK pathway ,Male ,Indoles ,Cell ,Apoptosis ,urologic and male genital diseases ,Tyrosine-kinase inhibitor ,Adrenomedullin ,Mice ,0302 clinical medicine ,tyrosine kinase inhibitor ,Sunitinib ,Tumor Cells, Cultured ,Medicine ,Extracellular Signal-Regulated MAP Kinases ,Mice, Inbred BALB C ,MEK inhibitor ,Prognosis ,female genital diseases and pregnancy complications ,Kidney Neoplasms ,Survival Rate ,ERK ,medicine.anatomical_structure ,Oncology ,030220 oncology & carcinogenesis ,hormones, hormone substitutes, and hormone antagonists ,medicine.drug ,Research Paper ,medicine.medical_specialty ,renal cell carcinoma ,medicine.drug_class ,MAP Kinase Signaling System ,Mice, Nude ,03 medical and health sciences ,Downregulation and upregulation ,Internal medicine ,Biomarkers, Tumor ,Animals ,Humans ,Pyrroles ,Carcinoma, Renal Cell ,Cell Proliferation ,business.industry ,Cell growth ,Xenograft Model Antitumor Assays ,030104 developmental biology ,Endocrinology ,Drug Resistance, Neoplasm ,Cancer research ,business - Abstract
// Yongqian Gao 1, * , Jinyi Li 2, * , Na Qiao 3, * , Qingsong Meng 3 , Ming Zhang 3 , Xin Wang 3 , Jianghua Jia 3 , Shuwen Yang 3 , Changbao Qu 3 , Wei Li 3 , Dongbin Wang 3 1 Department of Interventional Radiology, Tangshan Gongren Hospital, Hebei Medical University, Tangshan 063000, P.R. China 2 Department of Urology, Icahn School of Medicine at Mount Sinai, New York, 10029, USA 3 Department of Urologic Surgery, The Second Hospital of Hebei Medical University, Shijiazhuang, 050000, China * These authors contributed equally to this work Correspondence to: Dongbin Wang, email: dongbin.wang@outlook.com Keywords: renal cell carcinoma, adrenomedullin, tyrosine kinase inhibitor, ERK Received: April 29, 2016 Accepted: August 13, 2016 Published: August 22, 2016 ABSTRACT Purpose: To evaluate the mechanisms underlying sunitinib resistance in RCC and to identify targets that may be used to overcome this resistance. Results: Reanalysis of transcriptome microarray datasets (GSE64052 and GSE76068) showed that adrenomedullin expression was increased in sunitinib-resistant tumors. And adrenomedullin expression was increased in sunitinib-resistant tumor xenografts, accompanied by upregulation of phospho-ERK levels. However, blocking adrenomedullin inhibited sunitinib-resistant tumor growth. Treatment of RCC cells with sunitinib and ADM22-52 was superior to monotherapy with either agent. Additionally, adrenomedullin upregulated cAMP and activated the ERK/MAPK pathway, promoting cell proliferation, while knockdown of adrenomedullin inhibited RCC cell growth and invasion in vitro . Materials and methods: We searched the Gene Expression Omnibus (GEO) database to find data regarding sunitinib-resistant RCC. These data were subsequently reanalyzed to identify targets that contribute to sunitinib resistance, and adrenomedullin upregulation was found to mediate sunitinib resistance in RCC. Then, we created an RCC mouse xenograft model. Mice were treated with sunitinib, an adrenomedullin receptor antagonist (ADM22-52), a MEK inhibitor (PD98059) and different combinations of these three drugs to investigate their effects on tumor growth. RCC cells (786-0) were cultured in vitro and treated with an ADM22-52 or PD98059 to determine whether adrenomedullin activates the ERK/MAPK pathway. Adrenomedullin was knocked down in 786-0 cells via siRNA, and the effects of this knockdown on cell were subsequently investigated. Conclusions: Adrenomedullin plays an important role in RCC resistance to sunitinib treatment. The combination of sunitinib and an adrenomedullin receptor antagonist may result in better outcomes in advanced RCC patients.
- Published
- 2016
21. Single molecule targeted sequencing for cancer gene mutation detection
- Author
-
Liu Song, Deng Liwei, Yongqian Gao, Li Gailing, Wu Zengding, Michael W. Deem, Jiankui He, Wu Ping, Jinsen Cai, Ji Daorui, Zhao Luyang, Ge Liangjin, Gao Yan, Yan Qin, and Huan Jin
- Subjects
0301 basic medicine ,Cancer genome sequencing ,Genetics ,DNA nanoball sequencing ,Multidisciplinary ,Massive parallel sequencing ,High-Throughput Nucleotide Sequencing ,Sequence Analysis, DNA ,Biology ,DNA sequencing ,Article ,Massively parallel signature sequencing ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,Single cell sequencing ,030220 oncology & carcinogenesis ,Neoplasms ,Mutation ,Humans ,Pathology, Molecular ,Exome sequencing ,Illumina dye sequencing ,Genes, Neoplasm - Abstract
With the rapid decline in cost of sequencing, it is now affordable to examine multiple genes in a single disease-targeted clinical test using next generation sequencing. Current targeted sequencing methods require a separate step of targeted capture enrichment during sample preparation before sequencing. Although there are fast sample preparation methods available in market, the library preparation process is still relatively complicated for physicians to use routinely. Here, we introduced an amplification-free Single Molecule Targeted Sequencing (SMTS) technology, which combined targeted capture and sequencing in one step. We demonstrated that this technology can detect low-frequency mutations using artificially synthesized DNA sample. SMTS has several potential advantages, including simple sample preparation thus no biases and errors are introduced by PCR reaction. SMTS has the potential to be an easy and quick sequencing technology for clinical diagnosis such as cancer gene mutation detection, infectious disease detection, inherited condition screening and noninvasive prenatal diagnosis.
- Published
- 2016
22. Understanding Morphology-Dependent Polymer Aggregation Properties and Photocurrent Generation in Polythiophene/Fullerene Solar Cells of Variable Compositions
- Author
-
Edwards T. Niles, John K. Grey, Adam J. Wise, Thomas P. Martin, Yongqian Gao, and Alan K. Thomas
- Subjects
chemistry.chemical_classification ,Photocurrent ,Fullerene ,Materials science ,Absorption spectroscopy ,Analytical chemistry ,Resonance ,Polymer ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,symbols.namesake ,General Energy ,chemistry ,symbols ,Polythiophene ,Physical and Theoretical Chemistry ,Absorption (electromagnetic radiation) ,Raman spectroscopy - Abstract
We fabricate poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) thin film solar cells of variable weight/weight (w/w) compositions (i.e., 1:1 to 1:4) to systematically perturb polymer packing (aggregation) properties and assess their impact on local electronic structure and photocurrent generation efficiency. A combination of absorption spectroscopy and resonance Raman spectroscopic and photocurrent imaging techniques are used to quantify and spatially map morphology-dependent cofacial, π−π aggregated P3HT chains and correlate these structures to local photocurrent production characteristics. On average, increasing the PCBM weight fraction results in blue shifts and broadening for absorption and Raman spectra in the dominant P3HT C═C stretching mode region (∼1450−1470 cm−1), whereas symmetric stretching C—C modes show decreased intensities and red shifts. P3HT/PCBM absorption spectra are fitted near the resolved P3HT onset region using a weakly coupled H-aggregate model th...
- Published
- 2010
23. Resonance Raman Spectroscopic- and Photocurrent Imaging of Polythiophene/Fullerene Solar Cells
- Author
-
Yongqian Gao, John K. Grey, Alan K. Thomas, and Thomas P. Martin
- Subjects
chemistry.chemical_classification ,Photocurrent ,Materials science ,Fullerene ,business.industry ,Analytical chemistry ,Resonance ,Polymer ,chemistry.chemical_compound ,symbols.namesake ,chemistry ,symbols ,Polythiophene ,Optoelectronics ,General Materials Science ,Polymer blend ,Physical and Theoretical Chemistry ,Thin film ,business ,Raman spectroscopy - Abstract
Resonance Raman−photocurrent imaging (RRPI) is introduced to spatially map the morphology-dependent polymer aggregation state to local photocurrent generation efficiency in poly-(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) blend thin film photovoltaic devices. The C═C symmetric stretching mode of P3HT is decomposed into contributions from aggregated (IC═Cagg, ∼1450 cm−1) and unaggregated (IC═Cun, ∼1470 cm−1) chains, and the ratios of their integrated intensities (IC═Cagg/IC═Cun, R) is used as a reporter for the local P3HT aggregation state. Maps of R values and photocurrents are generated for both as-cast and annealed P3HT/PCBM devices that permit direct spatial correlations between the P3HT aggregation state and local photocurrent generation efficiency. Regions of increased P3HT aggregation are observed at both P3HT/PCBM interfaces and in P3HT-rich areas that result in decreased photocurrent generation. Voltage-dependent RRPI studies are also performed at several applie...
- Published
- 2009
24. Synthesis and optical properties of cubic In2S3 hollow nanospheres
- Author
-
Meng Zhang, Yitai Qian, Rui Zhang, Yi Liu, and Yongqian Gao
- Subjects
Nanostructure ,Materials science ,Chemical engineering ,law ,General Materials Science ,Nanotechnology ,Electron microscope ,Selected area diffraction ,Condensed Matter Physics ,High-resolution transmission electron microscopy ,law.invention ,Blueshift - Abstract
The cubic β-In2S3 hollow nanospheres was fabricated via two-step solvothermal approaches using InCl3·4H2O, CS2, and thioacetamide (C2H5NS) as the starting materials. The as-prepared cubic β-In2S3 possessed hollow nanosphere structures, whose outward diameters and shells are −75 and 20 nm, respectively. The samples were characterized by XRD, FESEM, TEM, SAED, and HRTEM. The optical properties of the cubic β-In2S3 hollow nanospheres were also investigated. UV–vis (280 nm) and PL (367 nm) spectra indicate that there exists obvious blue shift compared with the In2S3 bulk materials.
- Published
- 2007
25. Single molecule targeted sequencing for cancer gene mutation detection
- Author
-
Liu Song, Ji Daorui, Li Gailing, Jinsen Cai, Zhao Luyang, Gao Yan, Michael W. Deem, Wu Zengding, Yongqian Gao, Yan Qin, Huan Jin, Deng Liwei, Jiankui He, and Wu Ping
- Subjects
law ,Cancer gene ,Genomics ,Typing ,Cancer Gene Mutation ,Computational biology ,Human leukocyte antigen ,Biology ,Gene ,Polymerase chain reaction ,DNA sequencing ,law.invention - Abstract
With the rapid decline cost of sequencing, it is now clinically affordable to examine multiple genes in a single disease-targeted test using next generation sequencing. Current targeted sequencing methods require a separate step of targeted capture enrichment during sample preparation before sequencing, and the library preparation process is labor intensive and time consuming. Here, we introduced an amplification-free Single Molecule Targeted Sequencing (SMTS) technology, which combined targeted capture and sequencing in one step. We demonstrated that this technology can detect low-frequency mutations of cancer genes. SMTS has several advantages, namely that it requires little sample preparation and avoids biases and errors introduced by PCR reaction. This technology can be applied in cancer gene mutation detection, inherited condition screening and high-resolution human leukocyte antigen (HLA) typing.
- Published
- 2015
26. Hausmannite Mn3O4nanorods: synthesis, characterization and magnetic properties
- Author
-
Guifu Zou, Yongqian Gao, Yitai Qian, Jin Du, Lanlan Chai, and Yue Li
- Subjects
Materials science ,Yield (engineering) ,Magnetism ,Mechanical Engineering ,Bioengineering ,General Chemistry ,Coercivity ,law.invention ,Magnetization ,Crystallography ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Mechanics of Materials ,law ,Transmission electron microscopy ,General Materials Science ,Calcination ,Nanorod ,Electrical and Electronic Engineering ,Hausmannite - Abstract
High yield hausmannite (Mn3O4) nanorods with diameters of about 100 nm and lengths up to 15–20 µm have been prepared by vacuum calcining of the precursor (Mn3O4+MnOOH), which was hydrothermally prepared by the reaction of PEG-20000 and KMnO4 at 180 °C for 20 h. Transmission electron microscopy and the selected-area electron diffraction pattern reveal that these Mn3O4 nanorods show single-crystal growth along the [100] direction. The PEG-20000 and the calcination conditions have key effects on the morphology and phase purity of the product. Magnetism measurements show that the blocking temperature for these Mn3O4 nanorods is 41 K, which agrees with the bulk material value, whereas the remnant magnetization and coercivity are 0.89 μB and 6177 Oe respectively.
- Published
- 2006
27. Influence of Anions on the Morphology of Nanophase α-MnO2 Crystal via Hydrothermal Process
- Author
-
Yongqian Gao, Shenglin Xiong Yi Liu, Yitai Qian, and Zhenghua Wang
- Subjects
Materials science ,Morphology (linguistics) ,Inorganic chemistry ,Biomedical Engineering ,Nanowire ,Nanoparticle ,Bioengineering ,General Chemistry ,Condensed Matter Physics ,Hydrothermal circulation ,law.invention ,Crystal ,Chemical engineering ,Nanocrystal ,law ,X-ray crystallography ,General Materials Science ,Crystallization - Abstract
The alpha-MnO2 nanocrystal nanowires, nanoplates, and nanoflowers have been successfully synthesized by a common hydrothermal treatment of different solutions containing KMnO4 and NH4X (X = Cl-, Ac-, NO3-, SO4(2-), and PO4(3-)) at 140 degrees C for 24 h. The influence of anions on the morphology of final product is discussed. According to our experimental results, we proposed a possible mechanism of the formation of different morphologies of nano-phase alpha-MnO2 and considered that the growing process was due to the initial plate-like MO(x) absorbing different anions and cooperation with them, which contributes to the final morphology of the product.
- Published
- 2006
28. Mn-Doped Zinc Aluminate Nanoparticles: Hydrothermal Synthesis, Characterization, and Photoluminescence Properties
- Author
-
Zhenghua Wang, Li Mu, Yongqian Gao, Yitai Qian, and Junxi Wan
- Subjects
Luminescence ,Photoluminescence ,Nanostructure ,Materials science ,Light ,Aluminate ,Inorganic chemistry ,Biomedical Engineering ,chemistry.chemical_element ,Nanoparticle ,Bioengineering ,Phosphor ,Zinc ,law.invention ,chemistry.chemical_compound ,law ,Materials Testing ,Nanotechnology ,Hydrothermal synthesis ,General Materials Science ,Particle Size ,Crystallization ,Manganese ,Temperature ,Water ,General Chemistry ,Condensed Matter Physics ,Nanostructures ,chemistry ,Chemical engineering ,Aluminum - Abstract
A two-step synthesis method was developed to fabricate Mn-doped zinc aluminate (ZnAl2O4) nanoparticles, including the first step of ageing, and the second step of crystallization. The effects of preparation conditions, such as ageing temperature, crystallization time, and the pH on the Mn-doped ZnAl2O4 nanoparticles were systematically investigated. The photoluminescence (PL) properties of green phosphor Mn-doped ZnAl2O4 nanoparticles were also discussed. Compared with the bulk sample, the PL spectrum of Mn-doped ZnAl2O4 nanoparticles has distinct blue shift. This procedure provides a facile way for the synthesis of well-crystallized ZnAl2O4:Mn at low temperature.
- Published
- 2006
29. A Precursor-Based Route to ZnSe Nanowire Bundles
- Author
-
Qin Xie, Jianmin Shen, Yongqian Gao, Shenglin Xiong, Qun Tang, and Yitai Qian
- Subjects
Materials science ,Photoluminescence ,Solvothermal synthesis ,Analytical chemistry ,Nanowire ,Infrared spectroscopy ,Nanotechnology ,Thermal treatment ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Biomaterials ,X-ray photoelectron spectroscopy ,Transmission electron microscopy ,Electrochemistry ,Wurtzite crystal structure - Abstract
A large number of one-dimensional bundles of ZnSe nanowires with diameters ranging from 15-20 nm and lengths of up to tens of micrometers have been prepared via the thermal treatment of a ribbon-like precursor (ZnSe-3ethylenediamine), which has been synthesized by a mixed solvothermal route, in an argon atmosphere. The as-obtained precursor has been characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), IR spectroscopy, thermogravimetric analysis, and elemental analysis. XRD and high-resolution TEM characterization reveal that the as-synthesized ZnSe nanowires have the single-crystal hexagonal wurtzite structure with the [001] growth direction. The surface chemical composition of ZnSe nanowires has been studied by X-ray photoelectron spectroscopy. The cooperative action of the mixed solvents may be responsible for the formation of the morphology of the resulting products. Room-temperature photoluminescence measurements indicate the as-grown ZnSe nanostructures have a strong emission peak centered at 587 nm and two weak emission peaks centered at 435 and 462 nm. The strong emission from the ZnSe nanostructures reveals their potential as building blocks for optoelectronic devices.
- Published
- 2005
30. A facile route to synthesize uniform single-crystalline -MnO2 nanowires
- Author
-
Guifu Zou, Yongqian Gao, Junxi Wan, Yitai Qian, and Zhenghua Wang
- Subjects
Inorganic Chemistry ,Crystallography ,Aqueous solution ,Transmission electron microscopy ,Chemistry ,Scanning electron microscope ,Materials Chemistry ,Nanowire ,Hydrothermal synthesis ,Condensed Matter Physics ,High-resolution transmission electron microscopy ,Hydrothermal circulation ,Ion - Abstract
Single-crystalline α -MnO2 nanowires with diameters of 10–30 nm and lengths ranging from 6 to 10 μm have been successfully synthesized by hydrothermal treating a mixed solution of KMnO4 and NH4Cl at 140 °C for 24 h. The final products were characterized by XRD, FESEM, TEM and HRTEM. The effect of anion Cl− in the possible rolling formation mechanism was also briefly discussed.
- Published
- 2005
31. Spectroscopic and electrical imaging of disordered polymeric solar cells: understanding aggregation effects on material performance
- Author
-
Yongqian Gao, Alan K. Thomas, Thomas P. Martin, Adam J. Wise, Edwards T. Niles, and John K. Grey
- Subjects
chemistry.chemical_classification ,Photocurrent ,Materials science ,Photoluminescence ,Nanotechnology ,Polymer ,law.invention ,symbols.namesake ,chemistry ,law ,Solar cell ,symbols ,Electrical measurements ,Thin film ,Raman spectroscopy ,Luminescence - Abstract
The manner in which polymer chains pack and organize in thin film structures is crucial to maximizing the efficiency of charge and energy transport processes in solar cell devices. We use new spectroscopic and electrical imaging tools to spatially map and correlate local structure (chain conformation, packing, morphology) to local photocurrent generation efficiency. Both Raman and photoluminescence approaches are used that provide unique insights into important structural attributes and how they vary with film morphology. Simultaneous electrical measurements are then used to establish the roles of specific structural features to photocurrent production.
- Published
- 2010
32. Resonance chemical imaging of polythiophene/fullerene photovoltaic thin films: mapping morphology-dependent aggregated and unaggregated C=C Species
- Author
-
John K. Grey and Yongqian Gao
- Subjects
Chemical imaging ,Fullerene ,Morphology (linguistics) ,Absorption spectroscopy ,Analytical chemistry ,Resonance ,General Chemistry ,Biochemistry ,Catalysis ,symbols.namesake ,chemistry.chemical_compound ,Colloid and Surface Chemistry ,chemistry ,symbols ,Polythiophene ,Thin film ,Raman spectroscopy - Abstract
Resonance Raman spectroscopic imaging is introduced as a physical probe to identify and spatially map morphology-dependent variations of intra- and interchain interactions and order in poly-3-hexylthiophene (P3HT) and [6,6]-phenyl-C(61)-butyric acid methyl ester (PCBM) photovoltaic blend thin films. Absorption spectra and C=C symmetric stretching Raman modes of P3HT/PCBM blend films show contributions from two distinct species that are assigned as aggregated and unaggregated P3HT chains with characteristic Raman frequencies of approximately 1450 (I(C=C)(agg)) and approximately 1470 cm(-1) (I(C=C)(un)), respectively. Upon thermal annealing of blend films, the relative concentrations of I(C=C)(agg) and I(C=C)(un) species (R = I(C=C)(agg)/I(C=C)(un)) changes on average from 0.79 +/- 0.20 (as-cast) to 2.45 +/- 0.77 (annealed). It is proposed that R values report on the relative densities of states (DOS) of aggregated and unaggregated species, and resonance Raman imaging is then used to spatially map morphology-dependent variations of R values and uncover subclassifications of these species. From both R and frequency dispersion resonance Raman images of I(C=C)(agg) and I(C=C)(un) species, four distinct types of P3HT chains are identified and mapped in annealed P3HT/PCBM blend thin films: (i) highly aggregated/crystalline, (ii) partially aggregated, (iii) interfacial, and (iv) unaggregated/PCBM rich. The change in aggregation upon annealing is attributed to an increase in planarity of the P3HT chains that is determined from the ratios of C=C/C-C symmetric stretching mode intensities.
- Published
- 2009
33. Plasmonics: Hybrid Graphene-Giant Nanocrystal Quantum Dot Assemblies with Highly Efficient Biexciton Emission (Advanced Optical Materials 1/2015)
- Author
-
Enkeleda Dervishi, Niladri S. Karan, Aditya D. Mohite, Feng Wang, Yagnaseni Ghosh, Yongqian Gao, Andrei Piryatinski, Stephen K. Doorn, Andrew M. Dattelbaum, Jennifer A. Hollingsworth, Chris J. Sheehan, Oleksiy Roslyak, Han Htoon, and Gautam Gupta
- Subjects
Materials science ,business.industry ,Graphene ,Nanotechnology ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,law.invention ,Nanocrystal ,Quantum dot ,law ,Optical materials ,Optoelectronics ,business ,Plasmon ,Biexciton - Published
- 2015
34. Influence of anions on the morphology of nanophase alpha-MnO2 crystal via hydrothermal process
- Author
-
Yongqian, Gao, Zhenghua, Wang, Shenglin Xiong Yi, Liu, and Yitai, Qian
- Subjects
Anions ,Manganese Compounds ,Microscopy, Electron, Transmission ,X-Ray Diffraction ,Photochemistry ,Surface Properties ,Temperature ,Nanoparticles ,Nanotechnology ,Oxides ,Crystallization ,Phosphates - Abstract
The alpha-MnO2 nanocrystal nanowires, nanoplates, and nanoflowers have been successfully synthesized by a common hydrothermal treatment of different solutions containing KMnO4 and NH4X (X = Cl-, Ac-, NO3-, SO4(2-), and PO4(3-)) at 140 degrees C for 24 h. The influence of anions on the morphology of final product is discussed. According to our experimental results, we proposed a possible mechanism of the formation of different morphologies of nano-phase alpha-MnO2 and considered that the growing process was due to the initial plate-like MO(x) absorbing different anions and cooperation with them, which contributes to the final morphology of the product.
- Published
- 2006
35. Solution Phase Synthesis of Hollow SnO2Nanospheres at Room Temperature
- Author
-
Li Mu, Qinghui Cao, Weichao Yu, Yitai Qian, Yongqian Gao, and Xiangying Chen
- Subjects
Chemistry ,Nanotechnology ,General Chemistry ,Solution phase synthesis - Abstract
Hollow SnO2 nanospheres with diameters ranging from 100–120 nm have been synthesized via a room-temperature wet-chemical route. A possible formation mechanism of the hollow SnO2 nanospheres is brie...
- Published
- 2006
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.