1. Faculty of Electronic and Information Engineering, Huaiyin Institute of Technology, Huai’an, China
2. Faculty of Electrical & Electronics Engineering, University Malaysia Pahang, Pekan, Malaysia
3. Faculty of Electrical & Automation Engineering Technology, TATI University College, Kemaman, Malaysia
4. Nanotechnology and Catalysis Research Center (NANOCAT), University of Malaya, 50603 Kuala Lumpur, Malaysia