[1] Department of Chemical Science,Faculty of Science,Universiti Tunku Abdul Rahman,Jln Universiti,Bandar Barat,31900 Kampar,Perak,Malaysia
[2] Center for Ionics University Malaya
[3] Department of Physics,Faculty of Science,University of Malaya,50603 Kuala Lumpur,Malaysia
[4] Faculty of Engineering,Soka University,1-236 Tangi-cho,Hachioji,Tokyo 192-8577,Japan
[5] Department of Physics,Acharya Nagarjuna University,Nagarjuna Nagar 522 510,India