1. Department of Frontier Materials; Nagoya Institute of Technology; Gokiso-cho Showa-ku Nagoya 466-8555 Japan
2. Department of Physics; Faculty of Science; Universiti Putra Malaysia; 43400 UPM Serdang Selangor Malaysia
3. Department of Materials; Faculty of Mechanical Engineering; Universiti Teknologi Malaysia; 81310 Skudai Johor Malaysia
4. Department of Chemistry; Faculty of Science and Mathematics; Universiti Pendidikan Sultan Idris; 35900 Tanjong Malim Perak Malaysia