1. National Nanotechnology Center (NANOTEC)National Science and Technology Development Agency (NSTDA) Pathum Thani 12120 Thailand
2. School of ChemistryInstitute of ScienceSuranaree University of Technology Nakhon Ratchasima 30000 Thailand
3. Division of Materials TechnologySchool of EnergyEnvironment and MaterialsKing Mongkut's University of Technology Thonburi Bangkok 10140 Thailand