1. Department of Chemistry, College of Natural Science, Wollo University, P.O. Box 1145, Dessie 1000, Ethiopia
2. Department of Chemistry, School of Engineering, Presidency University, Bangalore 560064, Karnataka, India
3. Department of Chemistry, Debre Berhan University, P.O. Box 445, Debre Berhan 7260, Ethiopia
4. Department of Materials Science and Engineering, National Taiwan University of Science and Technology, Taipei 10607, Taiwan