Enhanced Near-Band Edge Emission from ZnO Nanorods by V2O5 Coating and Subsequent Thermal Annealing

Title
Enhanced Near-Band Edge Emission from ZnO Nanorods by V2O5 Coating and Subsequent Thermal Annealing
Authors
이완인
Keywords
Photoluminescence, ZnO/V2O5 Core?Shell Nanowires, Thermal Evaporation, TEM
Issue Date
2013
Publisher
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Series/Report no.
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY ; Vol14 no.7 Startpage 5181 Endpage 5186
Abstract
V2O5-coated ZnO 1D nanostructures were prepared by using a two step process: thermal evaporation of a mixture of ZnO and graphite powders (ZnO:C = 1:1) in an oxidative atmosphere and sputter-deposition of V2O5. Scanning electron microscopy revealed that the nanostructures had a rod-like morphology with the thickness diminishing gradually from an end to the other. The thicknesses and lengths of the nanorods range from a few tens to a few hundreds of nanometers and from a few to a few tens of micrometers, respectively. Transmission electron microscopy and X-ray diffraction analyses revealed that the ZnO cores and V2O5 shells of the core?shell nanorods were wurtzite-type hexagonal close-packed structured single crystal and amorphous, respectively. The intensity ratio of the near-band edge (NBE) emission to the deep-level emission was increased about three times by coating the ZnO nanorods with a V2O5 thin film about 10 nm thick. The NBE emission enhancement may be mainly attributed to two sources: the effects of suppression of capturing of carriers by surface states and suppression of visible emission and nonradiative recombination by depletion regions formed in the ZnO cores. In addition, it was found that postannealing of V2O5-coated ZnO nanorods is not desirable, whereas post annealing makes a positive effect on the NBE emission enhancement in uncoated ZnO nanorods.
URI
http://dspace.inha.ac.kr/handle/10505/33093
ISSN
1533-4880
Appears in Collections:
College of Natural Science(자연과학대학) > Chemistry (화학) > Local Access Journal Papers, Reports(화학 논문, 보고서)

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