Abstract
ZnO/(Zn,Cd)O nanoscale heterostructures were synthesized by a two-stage thermal evaporation method. The heterostructures consisted of ZnO nanocombs and (Zn,Cd)O nanocaps. Two types of nanocaps, wurtzite and cubic (Zn,Cd)O with different Cd contents, could be produced by tuning the growth conditions. The Cd vapour pressure played an important role in determining the morphology, structure and size of the (Zn,Cd)O nanocaps on the branches. Temperature-dependent PL measurements indicated that band-gap engineering of ZnO could be realized in the heterostructures of ZnO nanocombs with cubic (Zn,Cd)O nanocaps. This method can be used to synthesize ZnO nano-heterostructures with other materials.
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