1. Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, UKM, 43600 Bangi, Selangor, Malaysia
2. Department of Physics Education, Faculty of Tarbiyah, Universitas Islam Negeri Mahmud Yunus, Batusangkar 27213, Indonesia
3. Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Halu Oleo, Kendari 93132, Indonesia
4. School of Information Science and Technology, Fudan University, 220 Handan Road, Shanghai 200437, P. R. China