1. Department of Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005, Punjab, India
2. Department of Chemistry, Khalsa College, G. T. Road, Amritsar, Punjab 143002, India
3. Nanotechnology Research Laboratory, College of North Atlantic, Labrador City, NL A2V 2K7, Canada
4. Department of Chemistry, Natural and Applied Sciences, University of Wisconsin - Green Bay, 2420 Nicolet Drive, Green Bay, Wisconsin 54311-7001, United States