1. Department of Chemistry, Faculty of ScienceUniversity of Malaya Kuala Lumpur 50603 Malaysia
2. University Malaya Centre for Ionic Liquids, Department of Chemistry, Faculty of ScienceUniversity of Malaya Kuala Lumpur 50603 Malaysia
3. Low Dimensional Materials Research Centre, Department of Physics, Faculty of ScienceUniversity of Malaya 50603 , Kuala Lumpur Malaysia