[1] Govt Vidarbha Inst Sci & Humanities, Nanostruct Thin Film Mat Lab, Dept Phys, Amravati 444604, Maharashtra, India
[2] Shri Shivaji Coll, Dept Phys, Akola 444003, Maharashtra, India
[3] Univ Bombay, Natl Ctr Nanomat & Nanotechnol, Bombay, Maharashtra, India
[4] Univ Bombay, Dept Phys, Bombay 400098, Maharashtra, India