1. Department of Chemistry, BBK DAV College for Women, Amritsar 143005, Punjab, India
2. Department of Chemistry, Guru Nanak Dev University, Amritsar 143005, Punjab, India
3. Nanotechnology Research Laboratory, College of North Atlantic, Labrador City, NL A2 V 2K7 Canada
4. Department of Chemistry, Wilfrid Laurier University, Science Building, 75 University Avenue West, Waterloo ON N2L 3C5, Canada