1. Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia
2. Centre of Research in Ionic Liquids (CORIL), Universiti Teknologi PETRONAS, Seri Iskandar, Perak 32610, Malaysia
3. Centre for Foundation Studies in Science University of Malaya (PASUM), Kuala Lumpur, Federal Territory of Kuala Lumpur 50603, Malaysia
4. Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi, Selangor 43600, Malaysia