1. Fuel Cell InstituteUniversiti Kebangsaan Malaysia Bangi Selangor 43600 Malaysia
2. Department of Chemical and Process Engineering, Faculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia Bangi Selangor 43600 Malaysia
3. Institute of Microengineering and Nanoelectronics (IMEN)Universiti Kebangsaan Malaysia Bangi Selangor 43600 Malaysia