1. Department of Chemistry, Faculty of Science, Universiti Malaya, 50603 Kuala Lumpur, Malaysia
2. University of Malaya Centre for Ionic Liquids (UMCiL), Universiti Malaya, 50603 Kuala Lumpur, Malaysia
3. Photonics Research Centre, Deputy Vice Chancellor (Research & Innovation) Office, Universiti Malaya, 50603 Kuala Lumpur, Malaysia