1. School of Physics Universiti Sains Malaysia Gelugor 11800 Penang Malaysia
2. Department of Physics Balochistan University of Information Technology Engineering and Management Sciences Quetta 87300 Pakistan
3. Chemical Engineering Department Universiti Teknologi PETRONAS 32610 Seri Iskandar Malaysia
4. Institute of Microengineering and Nanoelectronics (IMEN) Universiti Kebangsaan Malaysia Bangi 43600 Selangor Malaysia