共查询到18条相似文献,搜索用时 687 毫秒
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利用牛血清蛋白合成CdS纳米棒和网状纳米线 总被引:1,自引:0,他引:1
采用简单易控、对环境友好的矿化方法, 利用牛血清蛋白(BSA)做模板, 通过Cd2+与硫代乙酰胺(TAA)反应制备了形貌均一的CdS纳米棒和网状纳米线. 分别采用透射电子显微镜(TEM)、X射线能谱(EDS)、X射线衍射(XRD)、荧光(PL)发射谱和导电原子力显微镜(C-AFM)等方法对不同实验温度下制备的CdS样品的结构形貌、成分组成和光学性质及微区电子传输行为进行了表征. 结果表明: 在实验反应温度为20 ℃时, 得到的产物为单分散性好的CdS 纳米棒, 长度为250 nm, 直径为30 nm; 在50 ℃时, 得到网状CdS纳米线, 其长度为2-3 μm; CdS纳米棒和网状纳米线均为立方相闪锌矿结构. 荧光性质的测试表明, CdS纳米棒和网状纳米线具有优良的荧光性能, 电流-电压(I-V)特性的表征表明CdS纳米线具有很好的电导特性. 相似文献
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闪锌矿结构CdS纳米晶的制备 总被引:3,自引:0,他引:3
以3-巯基丙酸为硫源, 采用水热法制备了尺寸小于10 nm、具有强光致荧光的闪锌矿型立方CdS半导体纳米晶. 用EDS能谱、透射电镜(TEM)、高分辨透射电镜(HRTEM)和XRD对晶体的化学成分、大小及结构进行了表征, 并分析了影响纳米晶尺寸的因素, 研究了闪锌矿型硫化镉纳米晶的荧光激发与发射谱. 相似文献
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以聚苯乙烯-马来酸酐为模板,合成了CdS,CdS︰Mn,ZnS,ZnS︰Mn及ZnS︰Tb纳米微粒.紫外吸收光谱表明所得微粒尺寸均匀,TEM结果显示CdS纳米微粒的尺寸为2.5 nm.从荧光光谱观察到掺杂离子的特征发射峰,证实了基质到掺杂离子的能量传递.通过红外光谱研究了聚合物与金属离子的键合作用,金属离子首先与聚合物的羧基配位,生成硫化物纳米微粒后,聚合物又包覆在纳米微粒的表面形成保护层. 相似文献
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A novel chemiluminescence (CL) performance of CdTe/CdS/ZnS quantum dots (QDs) with periodate (KIO4) was studied. Effects of concentration and pH on the CL system were investigated. Electron spin resonance (ESR) and the effects of radical scavenger analysis were employed for identification of intermediate species. The CL spectra for this system showed only one maximum emission peak centered around 620 nm, which was similar with photoluminescence (PL) spectra of CdTe/CdS/ZnS QDs. The CL of CdTe/CdS/ZnS QDs was induced by direct chemical oxidation and the possible mechanism could be explained by radiative recombination of injected holes and electrons. This investigation not only provided new sight into the optical characteristics of CdTe/CdS/ZnS QDs, but also broadened their potential optical utilizations. 相似文献
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微波萃取高效液相色谱法测定口红中芳香胺类化合物 总被引:6,自引:0,他引:6
利用微波萃取高效液相色谱法测定了口红中芳香胺类化合物.先将口红涂于玻璃片上,然后用微波萃取和高效液相色谱法测定萃取液中的芳香胺类化合物.研究了3种市售口红并得到了芳香胺类化合物的定量测定结果.考察了微波萃取的条件,并将薄层色谱等萃取分离方法和微波萃取法进行了比较,证明微波萃取法在萃取膏状物和蜡状物中的组分时,具有比其它方法更加方便、快速等优点. 相似文献
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CdS and CdS/ZnS core-shell structure nano particles were synthesized in micro emulsion, and characterized by X-ray diffraction(XRD), transmission electron microscopy (TEM), UV absorption spectra and PL. The average diameter of CdS was about 3.3 nm, and CdS/ZnS core-shell structure was confirmed by XRD and UV. Considering the optical properties of CdS/ZnS core-shell structure nanoparticles which have different ZnS shell thickness, the UV absorption edge of CdS/ZnS becomes as lightred-shift with the thickness of ZnS layer increasing, and the absorption of shortwave band is strongly enhanced at the same time. The PL spectra indicate that ZnS shell layer can greatly eliminate surface defects of CdS nanoparticles and make its band-edge directed recombination increased, and the luminous efficiency of CdS is improved greatly when it has appropriate shell thickness. 相似文献
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WU Xiao-chun ZOU Bing-suo XU Ji-ren TANG Guo-jing ZHANG Gui-lan CHEN Wen-ju 《高等学校化学学报》1995,16(Z1):29
The inverse micelle system of nanometer-sized CdS doped with Methylene Blue(MB) was synthesized and characterized by using absorption and fluorescence spectra. The results show that MB molecules were absorbed onto the surface of CdS nanoparticles and interacted with surfactants when its concentration was lower than 4×10-6 mol/L. From the comparison of their spectra, MB molecules by adsorption have a strong quenched fluorescence emission of CdS nanoparticles with surface defect states. All responses and main mechanism are ascribed to the charge transfer between the CdS organosol and Methylene Blue molecules. 相似文献
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A new ZnS/CdS heterojunction is constructed through the direct sulfurization of a metal ions exchanged Zn/Cd-MOF precursor(MOF=metal-organic framework material). The composition, structure, morphology, photo-absorption and photoelectric performance of the ZnS/CdS are characterized by powder X-ray diffraction(PXRD), scanning electron microscope(SEM), transmission electron microscope(TEM), diffuse reflection spectrum(DRS), photoelectric current(PEC), electrochemical impedance spectroscopy(EIS) and photoluminescence(PL) technologies. Since the metal ions are highly orderly separated by the organic ligands and the inherent porosity of the Zn/Cd-MOF, the as-synthesized ZnS/CdS possesses a large surface area and intimate contact at the heterogeneous interface with uniform ZnS/CdS nanoparticles. The photocatalytic hydrogen evolution activity of the ZnS/CdS is investigated under visible light irradiation(λ ≥ 420 nm). It exhibits enhanced photocatalytic performance that the optimal ZnS/CdS achieves a maximum average hydrogen production rate of 2348 μmol·h-1·g-1. A possible electron transfer mechanism is therefore proposed by the analyses of the Mott-Schottky plots. 相似文献
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SUXing-guang LINZhang-bi HUHai ZHANGJia-hua JINQin-han 《高等学校化学研究》2003,19(3):269-274
CdSe semiconductor nanocrystals capped by CdS were synthesized in the aqueous solution with 2-mercaptoethanol as the stabilizer. The CdS capping with a higher band-gap than that of the core crystallite has successfully eliminated the surface traps. Optical absorption and fluorescence emission spectra were used to probe the effect of CdS passivation on the electronic structure of the nanocrystals. The composite CdSe/CdS nanocrystals exhibit strong, narrow(FWHM≤40 nm) and stable band-edge photoluminescence. X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy were used to analyze the composite nanocrystals and determine their average size, size distribution, shape, internal structure and elemental composition. 相似文献