1. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
2. Shenzhen Key Laboratory of Thermoelectric Materials and Department of Physics, Southern University of Science and Technology, Shenzhen 518055, P. R. China
3. National Metal, Materials Technology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand
4. Center of Advanced Materials for Printed Electronics and Sensors, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand