1. Department of Physics, Dayananda Sagar Academy of Technology and ManagementBangalore 560082India
2. B. M. S. Academy of Science and Research, Affiliated to Tumkur UniversityBangalore 560019India
3. Department of Physics, B. M. S. College for WomenBangalore 560019India
4. Department of Chemistry, M. S. Ramaiah Institute of TechnologyBangalore 560054India
5. Department of Physics, Bangalore Institute of TechnologyBangalore 560004India
6. Department of Physics, BMS College of EngineeringBangalore 560019India
7. C.N.R. Center for Nano Research, Tumkur UniversityTumkur 572103India
8. Department of Nano Science and Technology, Mount Carmel CollegeBangalore 560052India