【摘要】 利用在醇介质中氨水催化水解硅酸乙酯(TEOS)制备SiO2来包覆半导体CdS纳米棒而形成CdS/SiO2核/壳结构.通过X射线衍射(XRD)、透射电子显微镜(TEM)证实SiO2包覆壳层为非晶,且壳层厚度随TEOS浓度的增大而增加,在10～30nm之间.并研究了其紫外-可见吸收光谱(UV-Vis)和荧光发射光谱(PL)的性质.更多还原

【Abstract】 Core/shell structures of CdS/SiO2 were synthesized through the ammonium hydroxide catalyzed hydrolysis of tetraethylorthosilicate(TEOS) in alcohol media containing pre synthesized CdS nanorods. X ray diffraction(XRD), transmission electron microscopy(TEM), UV Vis spectroscopy and photoluminescence spectroscopy were employed to characterize the obtained core shell structures. The thickness of the amorphous SiO2 shell ranges from 10 to 30 nm, and increases with the concentration of the TEOS used. The photoluminescence intensity of the core shell structures is enhanced for the CdS nanorod samples with only a thin layer (< 10 nm) of SiO2 shell on the CdS nanorod, and is reduced for the sample with a thicker SiO2 shell. Possible reasons contributing to the variations of the photoluminescence were discussed.更多还原