oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Solvothermal synthesis of CdS nanorods and photovoltaic characteristics of CdS/PVK composite system
YanLing Ji,Ke Cheng,HongMei Zhang,XingTang Zhang,YunCai Li,ZuLiang Du
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-007-0506-4
Abstract: Large quantities of CdS nanorods are successfully synthesized through Cd(CH3COO)2·2H2O reacting with Na2S·9H2O and EDA in aqueous solution. XRD result shows that the sample is of hexagonal structure. And TEM result shows that the morphologies of the resulting CdS are mainly in three-armed rod-like structure with a diameter of 10–15 nm and a length of 100 nm. The nanocomposites of CdS/PVK with different molar ratios are prepared by spin coating method on tin-doped indium oxide (ITO) substrate. A notable decrease of photoluminescence (PL) efficiency and a significant enhancement of surface photovoltage signal have been observed in CdS/PVK composites when the molar fraction of CdS increases. We interpret these results as the energy level matching between CdS and PVK in nanocomposites. This energy level matching facilitates fast interfacial charge transfer then increases the separation efficiency of electron-hole pairs and the carrier generation efficiency. The detailed charge transfer process has also been demonstrated.
Solvothermal synthesis of CdS nanorods and photovoltaic characteristics of CdS/PVK composite system
JI YanLing,CHENG Ke,ZHANG HongMei,ZHANG XingTang,LI YunCai,DU ZuLiang,

科学通报(英文版) , 2008,
Abstract: Large quantities of CdS nanorods are successfully synthesized through Cd(CH3COO)2·2H2O reacting with Na2S·9H2O and EDA in aqueous solution. XRD result shows that the sample is of hexagonal structure. And TEM result shows that the morphologies of the resulting CdS are mainly in three-armed rod-like structure with a diameter of 10–15 nm and a length of 100 nm. The nanocomposites of CdS/PVK with different molar ratios are prepared by spin coating method on tin-doped indium oxide (ITO) substrate. A notable decrease of photoluminescence (PL) efficiency and a significant enhancement of surface photovoltage signal have been observed in CdS/PVK composites when the molar fraction of CdS increases. We interpret these results as the energy level matching between CdS and PVK in nanocomposites. This energy level matching facilitates fast interfacial charge transfer then increases the separation efficiency of electron-hole pairs and the carrier generation efficiency. The detailed charge transfer process has also been demonstrated. Supported by Program for New Century Excellent Talents in University (Grant No. NCET-04-0653), the National Basic Research Program of China (973 Program) (Grant No. 2007CB616911) and the National Natural Science Foundation of China (Grant Nos. 20371015 and 90306010)
Facile solution growth of vertically aligned ZnO nanorods sensitized with aqueous CdS and CdSe quantum dots for photovoltaic applications  [cached]
Luan Chunyan,Vaneski Aleksandar,Susha Andrei,Xu Xueqing
Nanoscale Research Letters , 2011,
Abstract: Vertically aligned single crystalline ZnO nanorod arrays, approximately 3 μm in length and 50-450 nm in diameter are grown by a simple solution approach on a Zn foil substrate. CdS and CdSe colloidal quantum dots are assembled onto ZnO nanorods array using water-soluble nanocrystals capped as-synthesized with a short-chain bifuncional linker thioglycolic acid. The solar cells co-sensitized with both CdS and CdSe quantum dots demonstrate superior efficiency compared with the cells using only one type of quantum dots. A thin Al2O3 layer deposited prior to quantum dot anchoring successfully acts as a barrier inhibiting electron recombination at the Zn/ZnO/electrolyte interface, resulting in power conversion efficiency of approximately 1% with an improved fill factor of 0.55. The in situ growth of ZnO nanorod arrays in a solution containing CdSe quantum dots provides better contact between two materials resulting in enhanced open circuit voltage.
Trioctylphosphine as Both Solvent and Stabilizer to Synthesize CdS Nanorods  [cached]
Chen Shutang,Zhang Xiaoling,Zhang Qiuhua,Tan Weihong
Nanoscale Research Letters , 2009,
Abstract: High quality CdS nanorods are synthesized reproducibly with cadmium acetate and sulfur as precursors in trioctylphosphine solution. The morphology, crystalline form and phase composition of CdS nanorods are characterized by transmission electron microscopy (TEM), high-resolution TEM and X-ray diffraction (XRD). CdS nanorods obtained are uniform with an aspect ratio of about 5:1 and in a wurtzite structure. The influence of reaction conditions on the growth of CdS nanorods demonstrates that low precursor concentration and high reaction temperature (260 °C) are favorable for the formation of uniform CdS nanorods with 85.3% of product yield.
Fabrication of CdS/SnS Heterojunction for Photovoltaic Application  [PDF]
Hongnan Li, Shuying Cheng, Jie Zhang, Weihui Huang, Haifang Zhou, Hongjie Jia
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.51002
Abstract: SnS/CdS heterojunction is a promising system for photovoltaic application. SnS thin films were thermally evaporated onto CdS/ITO coated glass substrates. The structure of the device was glass/ ITO/CdS/SnS/In/Ag and I-V curves of the fabricated devices were measured under dark and illuminated conditions, respectively. We discussed the relationship of the thickness and annealing temperature of CdS buffer layers with the performance of SnS/CdS heterojunctions. The optimum thickness and annealing temperature of the CdS buffer layers were 50 nm and 350°C, respectively. The best device had a conversion efficiency of 0.0025%.
Preparation and properties of CdS/Au composite nanorods and hollow Au tubes
ZhaoHui Yang,HaiBin Chu,Zhong Jin,WeiWei Zhou,Yan Li
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-0061-2
Abstract: 1-dimensional (1D) metal-semiconductor nano-scale composite superstructures based on Au nanoparticles and CdS nanorods were prepared. The outer surface of CdS nanorods was modified with mercapto-ethylamine (MEA) in advance. With the aid of MEA, dense and uniform Au nanoparticles were deposited onto the external wall of CdS nanorods through in situ chemical reduction of AuCl4 ions. Those Au nanoparticles induced further electroless deposition and a continuous layer of Au was formed on CdS nanorods. Stable hollow Au tubes were obtained after the inner CdS cores were etched by HCl. UV-Vis, FL, XPS, EDX, TEM and SEM measurements were carried out to characterize the produced materials. The quenching of the defect emission of CdS in CdS-nanorod/Au-nanoparticle hybrid superstructures was detected, which was ascribed to the energy transfer from the exciton of CdS to surface plasma resonance level of Au.
Ion Exchange Processed CdS Nanorods in Powder Form Using Cadmium Hydroxide Nanowires By Wet Chemical Route  [cached]
Savita L. Patil,Rupali S. chaudhari,Ravindra D. Ladhe,Prashant K. Baviskar
Journal of Scientific Review , 2010,
Abstract: Simple, inexpensive and soft chemical route (wet chemical method) was employed for the synthesis of bulk forms of cadmium hydroxide [Cd(OH)2] nanowires bundles and their conversion to cadmium sulphide [CdS] nanorods at room temperature by simple anion exchange route. Due to difference in solubility product and diffusion rates of the Cd(OH)2 and CdS, the anion exchange reaction was taken place and CdS nanorods were formed. CdS nanorods were characterized by X-ray diffraction (XRD), and scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) analysis. Since CdS is semi-conducting material, it has variety of potential applications, this work demonstrates a cost effective method for the synthesis of CdS nanorods in bulk form like CNT.
Hydothermal Control Synthesis of Multi-armed CdS Nanocrystallites
多臂 CdS纳米晶体的水热控制合成

YUAN Qiu-Li,NIE Qiu-Lin,
袁求理
,聂秋林

无机材料学报 , 2007,
Abstract: Multi-armed CdS nanocrystallites were prepared via the hydrothermal method, in which CdCl·2.5H2O and (NH4)2S acted as the starting materials. The as-prepared products were characterized by TEM, ED, SEM, RAMAN, PL, respectively. Different ligants were chosen as the assistance agent to investigate their effects on the multi-armed CdS nanocrystallites. It was found that the yields of multi-armed CdS nanocrystallites were 2%, 35%, and 85% when ethylenediamine, methylamine and ethamine were employed as the assistance agent. Only nano-particles of CdS were observed when ammonia was used. In addition, the mechanism for the formation of multi-armed CdS nanocrystallites was primarily discussed.
Monodentate Ligand-assisted Hydrothermal Synthesis of CdS Nanorods
单齿络合剂辅助水热合成CdS纳米棒

NIE Qiu-Lin,YUAN Qiu-Li,XU Zhu-De,
聂秋林
,袁求理,徐铸德

无机材料学报 , 2004,
Abstract: Semiconductor CdS nanorods were successfully synthesized by the hydrothermal method with .monodentate ligand methylamine as assistant. The obtained CdS nanorods were characterized by using TEM, XRD, Raman, and PL techniques respectively. Effects of the concentration of methylamine on the morphologies of CdS nanocrystals were investigated. It was found that CdS nanocrystals synthesized displayed nano-particle, short nanorod, and long nanorod shape when the concentration of methylamine was 1, 5, and 20wt% in the hydrothermal process, respectively. This indicated that the type of ligand, i.e. bidentate or monodentate ligand, was not the critical factor for the formation of one dimention CdS nanocrystals in the hydrothermal process. Based on the experimental results, a complex structure-controlling mechanism was proposed.
Intracellular ZnO Nanorods Conjugated with Protoporphyrin for Local Mediated Photochemistry and Efficient Treatment of Single Cancer Cell
Kishwar S,Asif MH,Nur O,Willander M
Nanoscale Research Letters , 2010,
Abstract: ZnO nanorods (NRs) with high surface area to volume ratio and biocompatibility is used as an efficient photosensitizer carrier system and at the same time providing intrinsic white light needed to achieve cancer cell necrosis. In this letter, ZnO nanorods used for the treatment of breast cancer cell (T47D) are presented. To adjust the sample for intracellular experiments, we have grown the ZnO nanorods on the tip of borosilicate glass capillaries (0.5 μm diameter) by aqueous chemical growth technique. The grown ZnO nanorods were conjugated using protoporphyrin dimethyl ester (PPDME), which absorbs the light emitted by the ZnO nanorods. Mechanism of cytotoxicity appears to involve the generation of singlet oxygen inside the cell. The novel findings of cell-localized toxicity indicate a potential application of PPDME-conjugated ZnO NRs in the necrosis of breast cancer cell within few minutes.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.