1. Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-Nocho, Nishi-ku, Niigata 959-2181, Japan
2. Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
3. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand