1. Program of Physics, Faculty of Science and Technology, Sakon Nakhon Rajabhat University, Sakon Nakhon, Thailand
2. Center of Excellence on Alternative Energy, Research and Development Institution, Sakon Nakhon Rajabhat University, Sakon Nakhon, Thailand
3. National Metal and Materials Technology Center, National Science and Technology Development Agency, Pathumthani, Thailand
4. School of Physics, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima, Thailand