1. Department of Materials Science and Engineering School of Molecular Science and Engineering Vidyasirimedhi Institute of Science and Technology Wangchan Rayong 21210 Thailand
2. Research Center of Nano Science and Technology Shanghai University Shanghai 200444 P. R. China
3. Research Network of NANOTEC-VISTEC on Nanotechnology for Energy School of Molecular Science and Engineering Department Vidyasirimedhi Institute of Science and Technology Wangchan Rayong 21210 Thailand