1. Department of Chemistry; Faculty of Science; Universiti Putra Malaysia; 43400 Serdang Selangor Malaysia
2. Department of Mechanical and Materials Engineering; Lee Kong Chian Faculty of Engineering and Science; Universiti Tunku Abdul Rahman; 43000 Bandar Sungai Long Kajang Selangor Malaysia
3. Department of Physics; Faculty of Science; Universiti Putra Malaysia; 43400 Serdang Selangor Malaysia