1. Materials Science and Nanotechnology Program; Faculty of Science; Khon Kaen University; Khon Kaen 40002 Thailand
2. National Metal and Materials Technology Center (MTEC); Thailand Science Park; Pathumthani 12120 Thailand
3. Department of Physics; Faculty of Science; Khon Kaen University; Khon Kaen 40002 Thailand
4. Nanotec-KKU Center of Excellence on Advanced Nanomaterials for Energy Production and Storage; Khon Kaen 40002 Thailand
5. School of Physics; Institute of Science; Suranaree University; Nakhon Ratchasima 30000 Thailand