Acknowledgments
The authors thank the University Development Scholarship
(U.D.C) and the Royal Golden Jubilee Scholarship for financial support. We thank Associate Professor Dr. Sanong
Ekgasit and Adchara Padermshoke (Ph.D. student) from the
Sensor Research Unit, Department of Chemistry, Faculty of
Science, Chulalongkorn University for running samples using
attenuated total reflectance Fourier transform infrared
(ATR-FTIR) spectrometry.