1. Advanced Materials Center, Faculty of Engineering, University of Malaya, Malaysia, 50603 Kuala Lumpur, Malaysia
2. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Malaysia, 50603 Kuala Lumpur, Malaysia
3. Department of Chemistry, Faculty of Science, University of Malaya, Malaysia, 50603 Kuala Lumpur, Malaysia
4. Department of Chemical Engineering, Faculty of Engineering, University of Malaya, Malaysia, 50603 Kuala Lumpur, Malaysia
5. Institute of Ocean and Earth Sciences, Deputy Vice Chancellor (Research & Innovation) Office, University of Malaya, Malaysia, 50603 Kuala Lumpur, Malaysia
6. Dept. Magnetism and Superconductivity, National Institute of Materials Physics, 105 bis Atomistilor Str., Magurele,
J.Ilfov, POBox MG-7, 077125 Romania