1. Electrochemistry and Optical Spectroscopy Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University
2. Department of Chemistry, Faculty of Science, King Mongkut’s University of Technology Thonburi
3. Department of Chemistry, Faculty of Science, Okayama University
4. Center of Excellence for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University