1. Department of Chemistry, Acharya Nagarjuna University, Guntur, India
2. Department of Physics, Koneru Lakshmaiah Education foundation, Guntur, India
3. Engenharia de Petróleo, Centro Universitário Tiradentes, Maceió, Brazil
4. Department of Chemistry, J.K.C.C. Acharya Nagarjuna University, Guntur, India