1. Sensor Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Patumwan, Bangkok 10330, Thailand, Department of Chemistry, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Wattanna, Bangkok, 10110, Thailand, Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, and Center for Petroleum, Petrochemicals and Advanced Materials, Chulalongkorn University, Patumwan, Bangkok, 10330, Thailand