Authors: Changhyun Jin Hyunsoo Kim Kyungjoon Baek Hyoun Woo Kim Chongmu Lee
Publish Date: 2009/12/04
Volume: 21, Issue: 11, Pages: 1154-1158
Abstract
TiO2sheathed Ga2O3 onedimensional 1D nanostructures were synthesized by thermal evaporation of GaN powders and then sputterdeposition of TiO2 Transmission electron microscopy TEM and Xray diffraction XRD analysis results indicate that the Ga2O3 cores are of a single crystal nature with a monoclinic structure while the TiO2 shells are amorphous Photoluminescence PL emission is slightly decreased in intensity by TiO2 coating but it is significantly increased by thermal annealing in an oxygen atmosphere The emission peak is also shifted from ~500 to ~550 nm by oxygen annealing The increase in the green emission is due to the increase in the concentration of the Ga vacancies in the cores by the inflow of oxygen during oxygen annealing On the other hand annealing in a nitrogen atmosphere leads to a red shift of the emission to ~700 nm originating from nitrogen doping
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