1. Chemical Sciences Division, CSIR-Indian Institute of Petroleum, Haridwar Road, Mohkampur Dehradun-248005, India
2. Academy of Scientific and Industrial Research (AcSIR), New Delhi, India
3. Nanomaterials Unit, Inorganic and Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Uppal Road, Tarnaka, Hyderabad-500007, India