1. Department of Chemistry, B.B.K. D.A.V. College for Women, Amritsar 143005 Punjab, India
2. Department of Chemistry, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar, 144011 Punjab, India
3. Nanotechnology Research Laboratory, College of North Atlantic, Labrador City, Newfoundland and Labrador A2V 2K7, Canada
4. Department of Natural and Applied Sciences, University of Wisconsin−Green Bay, 2420 Nicolet Drive, Green Bay, Wisconsin 54311-7001, United States