1. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
2. Faculty of Applied Science, MARA University of Technology, Shah Alam, Malaysia
3. Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
4. Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia