1. School of Chemical Sciences Universiti Sains Malaysia 11800 Minden Penang Malaysia
2. Department of Chemical Sciences Faculty of Science and Technology Universiti Kebangsaan 43600 UKM Bangi Malaysia
3. Science and Engineering Research Centre (SERC) Universiti Sains Malaysia, Engineering Campus 14300 Nibong Tebal, Seberang Perai Selatan Penang Malaysia
4. Faculty of Resource Sciences and Technology Universiti Malaysia Sarawak 94300 Kota Samarahan Sarawak Malaysia