1. A.V. College of Arts, K.M. College of Commerce, E.S.A. College of Science, Vasai, India
2. Thin Film Research Laboratory, Department of Physics, B. K. Birla College (Autonomous), Kalyan, India
3. Department of Physics, K. J. Somaiya College, Vidyavihar, India
4. Nanotechnology Research Center, B. K. Birla College (Autonomous), Kalyan, India
5. Department of Physics, University of West Georgia, Carrollton, GA, USA