1. School of Physics and NANOTEC-SUT Center of Excellence on Advanced Functional Nanomaterials Suranaree University of Technology Nakhon Ratchasima 30000 Thailand
2. Thailand Center of Excellence in Physics Commission on Higher Education Bangkok 10400 Thailand
3. Department of Physics Faculty of Science Kasetsart University Bangkok 10900 Thailand
4. The Institute for the Promotion of Teaching Science and Technology Bangkok 10110 Thailand
5. Center of Excellence in Advanced Functional Materials Suranaree University of Technology Nakhon Ratchasima 30000 Thailand
6. Department of Physics Faculty of Science Chulalongkorn University Bangkok 10330 Thailand