1. Department of Technical and Applied Physics, School of Physics and Earth Sciences Technology, Technical University of Kenya, P.O. Box 52428-, 00200 Nairobi, Kenya
2. Department of Physics, Faculty of Science, Edo State University Uzairue, PMB 04, Auchi, 312101 Edo State, Nigeria
3. Department of Mathematics and Physics, Faculty of Applied Sciences, Cape Peninsula University of Technology, P.O. Box 1906, Cape Town, South Africa
4. Department of Chemical Engineering, Faculty of Industrial Technology, Universitas Pembangunan Nasional Veteran Yogyakarta, Sleman, Indonesia
5. Department of Chemistry, Faculty of Science and Technology, Airlangga University, Mulyorejo, Surabaya 60115, Indonesia