1. Department of Physics, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
2. Faculty of Engineering, Khon Kaen University, Khon Kaen 40002, Thailand
3. Institute for Integrated Radiation and Nuclear Science, Kyoto University, 2, Asashiro-Nishi, Kumatori, Sennan-gun, Osaka 590-0494, Japan
4. Institution of Nanomaterials Research and Innovation for Energy, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand