1. School of Chemical Engineering, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia
2. Department of PetroChemical Engineering, Faculty of Engineering and Green Technology, Universiti Tunku Abdul Rahman, Kampar 31900, Perak, Malaysia
3. Department of Chemical and Petroleum Engineering, Faculty of Engineering, Technology and Built Environment, UCSI University Kuala Lumpur, Cheras 56000, Kuala Lumpur, Malaysia
4. Nanomaterials Research Group, School of Chemical Sciences, Universiti Sains Malaysia, Gelugor 11800, Penang, Malaysia
5. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States