CdS量子点敏化TiO2薄膜电极的制备和光电化学性能

用水热微乳法制备了结晶性良好的CdS量子点,并通过连接分子巯基乙酸将CdS量子点自组装到多孔TiO2薄膜电极上.结果表明:CdS纳米颗粒的平均直径约为5nm,小于其量子尺寸;微乳体系为化学反应提供了良好的微型反应器,抑制了CdS晶粒的长大,而水热过程增强了CdS纳米颗粒的结晶性;由于CdS的可见光响应作用和CdS量子点...     

硫化镉纳米粒子的合成与应用

研究了用硫脲分子进行表面化学修饰的CdS纳米粒子的合成方法 ,并引入了一些表面活性剂作为平衡反离子 ,进一步对CdS表面作了修饰 ,增加了CdS纳米离子在有机溶剂中的稳定性和可分散性。我们还探讨了温度、浓度、pH等因素对合成的影响 ,并通过紫外 -可见吸收光谱等手段进行了表征。所得微粒呈球形 ,硫脲分子与CdS纳米粒子富Cd2 + 表面通过形成Cd -S配位键而修饰在粒子表面。这种表面修饰的CdS纳米材料在非线性光学及自组装方面具有优异的性能。还研究了含纳米硫化镉的有机 /无机杂化非线性光学薄膜材料的制备     

量子点荧光探针的温度和酸度合成条件研究

荧光量子点作为一种新型的生物标记物,CdS纳米团簇可以发射较强的对人眼较敏感的黄色荧光,可以作为荧光探针。溶液在无氧条件下,通入氮气,以巯基乙酸为稳定剂,水溶液通过调节pH,再经过12小时的搅拌,合成由巯基乙酸修饰的CdS纳米团簇。通过在不同的pH和温度下合成,得到其最适合的pH为10,随着温度的降低其荧光强度增强。     

功能化CdS:Mn的制备及荧光性质研究

用溶剂热法,在油胺溶剂中,160℃加热反应12h成功合成了CdS:Mn纳米晶体。并对油相中合成的材料进行了功能化修饰,用巯基乙酸对材料进行了包裹。借助X射线衍射分析、傅里叶红外光谱、荧光谱图等测试方法对材料进行了表征,XRD数据表明,合成的CdS:Mn晶体PDF#为80-0019。IR数据显示,在CdS:Mn材料上成功修饰上了羧酸(-COOH)。CdS:Mn晶体修饰前后主要发射峰从527nm蓝移至489nm。     

硫化镉纳米粒子的合成与应用

研究了用硫脲分子进行表面化学修饰的CdS纳米粒子的合成方法，并引入了一些表面活性剂作为平衡反离子，进一步对CdS表面作了修饰，增加了CdS纳米离子在有机溶剂中的稳定性和可分散性，我们还探讨了温度，浓度，pH等因素对合成的影响，并通过紫外一可见吸收光谱等手段进行了表征，所得微粒呈球形，硫脲分子与CdS纳米粒子富Cd^2 表面通过形成Cd-S配位键而修饰在粒子表面，这种表面修饰的CdS纳米材料在非线性光学及自组装方面具有优异的性能，还研究了含纳米硫化镉的有机／无机杂化非线性光学薄膜材料的制备。     

功能化硫化镉纳米晶-甲基乙烯基硅橡胶杂化材料的制备及光学性能

以氯化镉和硫化钠为原料,2-巯基乙醇为配体,水/N,N-二甲基甲酰胺为溶剂,采用液相法制备了表面富有羟基且分散均匀的硫化镉(CdS)纳米晶;再以γ-甲基丙烯酰氧丙基三甲氧基硅烷对其进行修饰,以制备表面富含双键的功能化CdS纳米晶,然后将这种具有末端双键的功能化CdS纳米晶与甲基乙烯基硅橡胶(MVQ)共聚合,制备了光学性...     

有机溶剂热生长技术制备硫族化合物及其光学特性的研究

以有机溶剂热生长技术(solvothermaltechnique)制备了半导体硫族化合物(CdS、ZnS、MoS2)等纳米颗粒,采用XRD、TEM等技术对其结构进行表征.以ITO导电玻璃以及导电聚合物(PANI、PPY)膜为基底,将纳米颗粒涂布其上并以PL法研究其光学特性,实验结果表明:经修饰后,材料的荧光发射位置发生显著的变化.     

CdS/TiO2复合纳米粒子的制备及其产氢性能研究

采用化学沉淀法制备了CdS包覆TiO2（CdS/TiO2）复合纳米粒子,利用XRD、TEM、SEM、UV-vis吸收光谱等对其进行了表征分析,并以可见光分解水制氢为探针反应考察了复合纳米粒子的活性。结果表明,CdS/TiO2 复合纳米粒子的颗粒大小约为40nm,TiO2 以锐钛矿型存在,CdS以六方相存在;复合纳米粒子的吸收光谱较TiO2 发生“红移”,大幅拓宽了对可见光区的吸收范围。光解水制氢实验表明,CdS/TiO2 复合纳米粒子具有良好的可见光释氢活性和光学稳定性。     

CdS/TiO_2复合纳米粒子的制备及其产氢性能

采用化学沉淀法制备了CdS包覆TiO2(CdS/TiO2)复合纳米粒子,利用XRD、TEM、SEM、UV-Vis吸收光谱等对其进行了表征分析,并以可见光分解水制氢为探针反应考察了复合纳米粒子的活性。结果表明,CdS/TiO2复合纳米粒子的颗粒大小约为40 nm,TiO2以锐钛矿型存在,CdS以六方相存在;复合纳米粒子的吸收光谱较TiO2发生"红移",大幅拓宽了对可见光区的吸收范围。光解水制氢实验表明,CdS/TiO2复合纳米粒子具有良好的可见光释氢活性和光学稳定性。     

巯基乙酸修饰ZnS纳米颗粒的水相合成及表征

以巯基乙酸(HSCH2COOH, RSH)为表面修饰剂,采用水相合成法制备了表面修饰巯基乙酸的ZnS纳米颗粒. 采用透射电子显微镜、粒度分布、X射线衍射和红外光谱等对ZnS纳米颗粒进行了表征,并对ZnS纳米粒子的制备条件进行了详细的考察. 结果表明,水相合成法的最佳制备条件为：反应pH值8.0, Zn2+:S2-:RSH(摩尔浓度比)为1:1.34:2. 在最佳条件下可制备粒径小(11 nm)且粒度分布窄、分散性好的ZnS纳米粒子,其晶体属面心立方b-闪锌矿结构.     

CdS/PVA In-Situ Polymerization Composite Films with Enhanced Structural,Optics, Limiting Effect and Electrical Properties

Cadmium sulfide doped Poly(vinyl alcohol) (CdS/PVA) polymeric films have synthesized by using in-situ polymerization technique and ultrasonic approach at the various molar weight of CdS. Subsequently, CdS/PVA polymeric films have been prepared with the objective of studying the effect of CdS nanoparticles on structural, optical and dielectric properties of PVA matrix films. XRD analysis was used to investigate the structural changes of CdS/PVA polymeric films. XRD study evidently shows a cubic crystal structure for CdS powder with the lattice constants a?=?5.818 Å and the space group F-43m. All polymeric films revealed the appearance of smaller new peaks related to the presence of CdS into PVA matrix. The dependence of optical properties was investigated by using UV–vis spectroscopy. The estimated band gaps energies revealed a redshift that confirms the active region in solar cell devices. The optical limiting effect showed a completely UV–Vis blocking of the synthesized polymeric films at the high molar of CdS contents. Dielectric properties were measured by using high-frequency LCR meter (4200-SCS) and were found to be strongly dependent on frequency and molar of CdS concentration. Dielectric permittivities were strongly influenced by the applied angular frequency and the real parts were decreased with increasing the molar CdS concentration. AC conductivity increased with angular frequency and decreased with increase in molar weight of CdS content. The results revealed that all synthesized materials are potentially suitable for optics technology devices.     

Pickering乳液聚合法CdS/PS荧光复合微球的制备与表征

通过水相合成法制备水溶性硫化镉(CdS)纳米晶,以CdS纳米晶固体粒子为乳化剂,进行Pickering乳液聚合制得CdS/PS荧光复合微球。通过SEM、XRD、FTIR、UV-vis、PL对CdS/PS荧光复合微球的微观结构、结晶情况及光学性能进行了分析和表征。结果表明,该复合微球具有以PS为核、CdS纳米晶为壳的核壳结构;复合微球的平均粒径为450nm;在复合微球中,CdS纳米晶仍然保持其量子尺寸效应,复合微球表现出了较好的荧光性能。     

CdS-QDs/PSt纳米复合材料的制备及荧光性能研究

采用液体-固体-溶液界面相转移和相分离法(LSS)制备单分散CdS量子点(CdS-QDs);通过自由基本体聚合合成单分散CdS量子点/聚苯乙烯(CdS/PSt)纳米复合材料,采用HRTEM、XRD、FTIR、PL对CdS纳米晶、CdS/PSt复合材料的微观结构、形貌、化学组成、光学性能进行了表征。结果表明:CdS纳米晶为单分散,粒径约为4nm;所制备的CdS/PSt纳米复合材料具有优越的荧光性能及荧光稳定性,其聚合物中的CdS纳米晶仍然保持很好的量子尺寸效应和良好的分散性。     

自牺牲模板法制备CdSe负载的CdS纳米线及其表征

以六方相CdS纳米线为前驱物,在不同浓度的Na2SeSO3水溶液中,采用水热合成法制备了负载量可控的CdSe沉积的CdS纳米线复合材料。采用XRD、SEM、TEM、UV-vis、PL和FTIR对该复合材料的物相、组成、形貌及光学性能进行了详细表征。结果表明,CdSe呈纤锌矿型六方相结构的纳米层形态沉积在CdS表面,其负载量受Na2SeSO3水溶液浓度、反应温度和反应时间控制;与CdS纳米线相比,纳米复合材料的可见光吸收范围明显扩大,覆盖了可见光的大部分区域,而其中的CdS纳米线荧光因CdSe的存在出现猝灭现象,同样,也未观察到CdSe的荧光。该文详细讨论了相关的光学性质以及纳米复合物的反应机理。     

自牺牲模板法制备CdSe负载的CdS纳米线及其表征

以六方相CdS纳米线为前驱物，在不同浓度的Na2SeSO3溶液中，采用水热合成法制备了负载量可控的CdSe沉积的CdS纳米线复合材料。采用XRD、SEM、TEM、UV-Vis、PL和FTIR对该复合材料的物相、组成、形貌及光学性能进行了详细表征。结果表明，CdSe呈纤锌矿型六方相结构的纳米层形态沉积在CdS表面，其负载量受Na2SeSO3溶液浓度、反应温度和反应时间控制；与CdS纳米线相比，纳米复合材料的可见光吸收范围明显扩大，覆盖了可见光的大部分区域，而其中的CdS纳米线荧光因CdSe的存在出现淬灭现象，同样，也未观察到CdSe的荧光。文章详细讨论了相关的光学性质以及纳米复合物的反应机理。     

Synthesis of Tapered CdS Nanobelts and CdSe Nanowires with Good Optical Property by Hydrogen-Assisted Thermal Evaporation

The tapered CdS nanobelts and CdSe nanowires were prepared by hydrogen-assisted thermal evaporation method. Different supersaturation leads to two different kinds of 1D nanostructures. The PL measurements recorded from the as-prepared tapered CdS nanobelts and CdSe nanowires show only a bandgap emission with relatively narrow full-width half maximum, which means that they possess good optical property. The as-synthesized high-quality tapered CdS nanobelts and CdSe nanowires may be excellent building blocks for photonic devices.     

Poly(vinyl-pyrrolidone) assisted hydrothermal synthesis of flower-like CdS nanorings

Well-defined CdS nanorings with flower-like morphology were synthesized by a hydrothermal method using poly(vinyl-pyrrolidone) as capping agent. The phase composition, morphology, structure, and optical properties of CdS nanorings were characterized by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscopy, and UV–vis absorption spectroscopic techniques. The XRD pattern of the sample can be indexed to the cubic zinc blende phase CdS. According to the quantitative analysis of energy-dispersive spectrum, the Cd:S molar ratio of the sample is about 1:0.96. The possible formation mechanism of the CdS nanorings is proposed which is based on time-resolved experiments. Furthermore, the absorption peak of CdS nanorings is red-shifted to 523 nm in the UV–vis absorption spectrum.     

Synthesis of Volcano‐Like CdS/Organic Nanocomposite

Cadmium sulfide/organic nanocomposites, which were based on long nanowires, were synthesized by a simple reaction between cadmium nitrate and thioglycolic acid (TGA) at room temperature. The products were characterized by X‐ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), selected‐area electron diffraction (SAED), Fourier transform infrared (FTIR) spectra, and thermogravimetric analysis (TG). The CdS/organic nanocomposites was decomposed into pure wurtzite CdS nanorods through hydrothermal treatment at 190°C. Photoluminescence (PL) spectra were used to study the optical properties of CdS/organic composite and pure CdS. It is found that the emission maximum of the CdS/TGA nanocomposite is significantly blue‐shifted, and the intensity is highly enhanced as compared to the luminescence spectrum of the bare CdS nanorods.     

Optical study of poly(3-decylthiophene)/CdS nanocomposites

Nanocomposites comprised of poly(3-alkyl thiophenes) (P3ATs)/semiconductor nanoparticles exhibited excellent photoelectricity performance because of contributions from both the P3ATs and the semiconductor nanoparticles. In this article, poly(3-decylthiophene) (P3DT) was synthesized and P3DT/CdS nanocomposites were prepared using an in-situ method. The CdS nanoparticles exhibited strong quantum effect on the photoluminescence (PL) properties of P3DT/CdS and the nanocomposites exhibit an enhanced PL and red-shifted emission with increasing CdS content. The PL quenched at CdS-to-3DT ratio at 0.35 mol%. The charge-transfer process between P3DT and CdS particles is discussed. P3DT/CdS composites also exhibit excellent nonlinear optical (NLO) properties. The third-order NLO coefficient of P3DT/CdS (χ⁽³⁾ = −4.62 × 10⁻¹² esu) is higher than that of P3DT. The P3DT/CdS nanocomposites have potential optical applications. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers     

Hydrothermal synthesis of ZnO–CdS nanocomposites: Structural,optical and electrical behavior

ZnO–CdS nanocomposites with three different molar ratios of 25:75, 50:50 and 75:25 were synthesized by simple hydrothermal technique. Powder X-ray diffraction patterns confirmed the phase formation of ZnO and CdS in ZnO–CdS nanocomposites. The calculated crystallite size was found in the range of 33–38 nm and 15–21 nm for ZnO and CdS respectively. HRSEM images revealed flake-like morphology for all samples. Energy dispersive X-ray spectra confirmed the presence of all the elements. The estimated optical bandgap was found in the range of 3.71–3.35 eV. IR spectra confirmed the formation of stretching vibration in ZnO and CdS. Dielectric analysis was performed in order to study Ac conductivity, dielectric constant and dielectric loss. Photoconductivity studies revealed that ZnO–CdS nanocomposites material exhibited sound photo-response characteristics.