1. Department of Physical Science, Faculty of Applied Sciences, Tunku Abdul Rahman University College, Jalan Genting Kelang, Setapak, Kuala Lumpur 53300, Malaysia
2. Nanotechnology & Catalysis Research Centre (NANOCAT), Level 3, IPS Building, University of Malaya, 50603 Kuala Lumpur, Malaysia
3. Department of Bioprocess and Polymer Engineering, School of Chemical & Energy Engineering, Universiti Teknologi Malaysia, Skudai 81310, Malaysia