Effects Of Noble Metal Nanoparticles On The Opticalelectro Properties Of Individual ZnO Nanobelt

Because of unique physical and chemical properties, Zinc Oxide(ZnO) has become hot spot during the decades among many kinds of semiconductor. Comparing with pure ZnO, metal/ZnO composite nanometer material shows better electric conductivity, higher luminescent efficiency, and higher thermal stability.Consequently, the manufacture and application of metal/ZnO composite nanometer material are the focus in recent times.This article takes the chemical vapor deposition(CVD) method for the synthesis of ZnO nanowires, and samples′morphology characterization is tested by scanning electron microscopy. Micro-grid template method is used to fabricate micro-electrode of individual ZnO nanobelt devices, Au and Pt nanoparticles are used to modify an individual ZnO nanobelt.Photoluminescence spectrum is studied by in situ observation on the different positions of individual ZnO、Au/ZnO and Pt/ZnO composite nanobelt respectively,aiming at the influence of the NBE enhancement ratio of ZnO by surface plasmons and defect level. The result demonstrates Au and Pt nanoparticles could enhance NBE,while suppress defect level emission. It proves defect levels are different in different nanobelts or the different positions in an individual nanobelt, the bigger defect level is,the bigger NBE enhancement ratio is. The effect of Pt nanoparticles on an individual ZnO nanobelt has not been reported. In situ observation of photoluminescence spectrum is used to research the surface plasmon resonance of metal in the fixed positions of nanometer materials, and it will be useful for the creation of highly efficient solid-state emitters.The I-V curves for devices are measured by semiconductor parameter measuring instrument with and without ultraviolet light, to study the influence factors of light current and dark current. The result shows that the effect on the change of photo current differs from that of dark current by Au nanoparticles: the photo current increases firstly then decreases, and the dark current grows with prolonging Au sputtering time. The possible effect factors on the change of current have also been discussed.