1. Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Phayathai Road, Bangkok10330, Thailand
2. National Metal and Materials Technology Center, Thailand Science Park, Paholyothin Road, Pathumthani12120, Thailand
3. Department of Chemistry, Imperial College London, LondonW12 0NZ, U.K.
4. Department of Physics, Faculty of Science, Burapha University, Long-Hard Bangsaen Road, Chonburi20131, Thailand