1. Department of Physics and Research Centre, Annai Velankanni College, Tholayavattam, 629157, Kanyakumari District, Tamil Nadu 629157, India
2. Manonmanium Sundaranar University, Abishekapattai, Tirunelveli 727 012, Tamilnadu, India
3. Institute of Functional Materials and Agricultural Applied Chemistry, Jiangxi Agricultural University, Nanchang 330045, P. R. China