1. Department of Chemistry, Faculty of ScienceMahidol University Ratchathewi, Bangkok 10400 Thailand
2. Department of Materials Science and Engineering, School of Molecular Science and EngineeringVidyasirimedhi Institute of Science and Technology (VISTEC) Wang Chan, Rayong 21210 Thailand
3. Research Network of NANOTEC‐VISTEC on Nanotechnology for EnergyVidyasirimedhi Institute of Science and Technology Wang Chan, Rayong 21210 Thailand