1. Department of Materials and metallurgical Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Patum- Thani, Thailand
2. Sensor Research Unit (SRU), Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
3. Research Network NANOTEC-CU on Advanced Structural and Functional Nanomaterials, Chulalongkorn University, Bangkok, Thailand