1. Department of Physical Science, Faculty of Applied Sciences, Tunku Abdul Rahman University College, 50932 Setapak, Kuala Lumpur, Malaysia
2. Research Centre for Crystalline Materials, School of Science and Technology, Sunway University, 47500 Bandar Sunway, Selangor Darul Ehsan, Malaysia
3. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor Darul Ehsan, Malaysia