1. Department of Sciences and Humanities Rajiv Gandhi Institute of Petroleum Technology Jais, Amethi 229304
2. Department of Chemical Engineering and Biochemical Engineering Rajiv Gandhi Institute of Petroleum Technology Jais, Amethi 229304
3. Raman and Photoluminescence Laboratory Material Science and Engineering Indian Institute of Kanpur- 208016
4. Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005