1. Department of Inorganic Chemistry, Indian Association for the Cultivation of Science,
Jadavpur, Kolkata 700 032, India
2. Polymer Science Unit, Indian Association for the Cultivation of Science,
Jadavpur, Kolkata 700 032, India
3. Department of Electrical Engineering, Bengal Engineering and Science University, Howrah 711
103, India
4. Department of
Chemistry, Jadavpur University, Jadavpur,
Kolkata 700 032, India