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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。
The hexagonal CdS nanowires were used as precursors to prepare CdSe CdS nanowire composites with controlled loadings by hydrothermal synthesis in Na2SeSO3 aqueous solutions with different concentrations. The phase, composition, morphology and optical properties of the composites were characterized by XRD, SEM, TEM, UV-vis, PL and FTIR. The results show that CdSe has a wurtzite hexagonal nanocomposite deposited on the surface of CdS. The loading of CdSe is controlled by the concentration of Na2SeSO3 aqueous solution, the reaction temperature and the reaction time. Compared with CdS nanowires, the visible light absorption range Obviously widened and covered most of the visible light region. However, CdS nanowire fluorescence quenched due to the presence of CdSe, and similarly, no fluorescence of CdSe was observed. This paper discusses in detail the related optical properties and the reaction mechanism of nanocomposites.