1. Department of Chemistry, College of Natural and Computational Sciences, Debre Markos University, Debre Markos, P.O. Box 269, Ethiopia
2. Department of Chemistry, College of Science, Bahir Dar University, Bahir Dar H9FX+Q62, Ethiopia
3. Department of Physics, College of Science, Bahir Dar University, Bahir Dar H9FX+Q62, Ethiopia