1. Universiti Malaya,Nanotechnology and Catalysis Research Centre,Kuala Lumpur,Malaysia,50603
2. Jagannath University,Department of Physics,Dhaka,Bangladesh,1100
3. Universiti Teknologi MARA,Faculty of Electrical Engineering,Shah Alam,Malaysia
4. School of Electrical Engineering, Universiti Teknologi Malaysia,Johor Bahru,Malaysia