1. College of Engineering, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang 43000, Malaysia
2. Faculty of Electronic Engineering & Technology, Universiti Malaysia Perlis (UniMAP), Arau 02600, Malaysia
3. Institute of Sustainable Energy, Universiti Tenaga Nasional, Jalan IKRAM-UNITEN, Kajang 43000, Malaysia
4. Geopolymer and Green Technology, Centre of Excellent (CEGeoGTech), Universiti Malaysia Perlis (UniMAP), Arau 02600, Malaysia
5. Solar Energy Research Institute, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia
6. Engineered Nanosystems Group, School of Science, Aalto University, Tietotie 1, 02150 Espoo, Finland