自牺牲模板法制备CdSe沉积的CdS纳米线及其表征  

Facile Fabrication of CdSe-deposited CdS Nanowires Using Self-sacrificial Templates

作　　者：滑永永[1] 李丽[1] 嵇天浩[1] 

机构地区：[1]北京工商大学理学院,北京100048

出　　处：《精细化工》2012年第6期526-530,共5页Fine Chemicals

基　　金：国家重点基础研究发展计划(973计划)资助项目(2006CB932605)~~

摘　　要：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。A series of CdSe-deposited CdS nanowires with different CdSe content were prepared from precursor hexagonal CdS nanowires in Na2SeSO3 aqueous solution with different concentrations using hydrothermal method. The phases, compositions, morphologies and optical properties of these composite nanowires were further characterized using XRD, SEM, TEM, UV-vis, PL and FTIR measurement techniques. The results show that the CdSe with nano-layer crystal deposited on the surface of CdS nanowires exhibits hexagonal wurtzite structure; such CdSe content can be controlled by changing Na2SeSO3 aqueous concentration,reaction temperature and/or reaction time. In comparison with optical properties of CdS nanowires, the absorption range of the nanocomposites becomes much wider, whereas the CdS fluorescence in the nanocomposites shows quenching behavior due to the existence of CdSe, and also, the emission of the CdSe has not been observed. In addition, their optical properties and reaction mechanism are elucidated in detail.

关 键 词：自牺牲模板法 纤锌矿型结构 CdS纳米线 CdSe沉积 反应机理 功能材料 

分 类 号：O613[理学—无机化学] TB381[理学—化学]