Abstract
Rational design of hybrid nanostructures through attaching nanowires with nanoparticles isan effective route to enhance the existing functionalities or to explore new ones. We carryout a systematic investigation on the photoluminescence of ZnO nanowire–Aunanoparticle hybrid nanostructures synthesized by attaching Au nanoparticles ontoZnO nanowires. Citrate-stabilized 40 nm Au nanoparticles effectively quench thegreen emission and enhance the UV emission of the ZnO nanowires, which isconsistent with the wavelength-dependent generation of surface plasmon. TheUV/green emission intensity ratio could be reversibly and reproducibly tailored by attaching/detachingAu nanoparticles. This enhancement of UV emission diminishes if the Au nanoparticles arecoated with a polymer layer. We also find that the orange-red emission of the ZnOnanowires is related to the excess oxygen on the ZnO surface, and it is also tunable viaannealing and surface modifications.
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