1. Nanoscience and Nanotechnology Graduate Program, Faculty of Science, King Mongkut's University of Technology Thonburi (KMUTT), Bangkok 10140 Thailand
2. Theoretical and Computational Science Center (TaCS), Faculty of Science, King Mongkut's University of Technology Thonburi (KMUTT), Bangkok 10140 Thailand
3. Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371
4. School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
5. Noyes Laboratory, California Institute of Technology, Pasadena, California 91125, USA