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通过分别生长核层与壳层制备出了ZnO/CuO核壳结构的纳米线。形貌和结构分析表明,ZnO核为单晶纳米线而CuO则以多晶形式覆盖在核层表面上。光致发光(PL)研究表明,ZnO纳米线PL强度随CuO壳层厚度的变化而变化。当壳层比较薄时ZnO的PL强度增大,这主要是由于CuO壳层对ZnO核层的修饰减少了表面态,而当壳层厚度增加到一定程度时,ZnO的PL强度不再变化,这主要是由于在核壳结构中形成了type-I型结构的原因。我们对这一现象做了详细的讨论。
The ZnO / CuO core-shell nanowires were prepared by growing the core and shell respectively. Morphology and structure analysis show that the ZnO core is monocrystalline nanowires and the CuO is polycrystalline on the surface of the nucleation layer. Photoluminescence (PL) studies show that the PL intensity of ZnO nanowires varies with the thickness of the CuO shell. When the shell is thinner, the PL intensity of ZnO increases, which is mainly due to the modification of ZnO core layer by CuO shell to reduce the surface state. When the shell thickness increases to a certain extent, the PL intensity of ZnO does not change any more, This is mainly due to the type-I structure formed in the core-shell structure. We have discussed this phenomenon in detail.