1. Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, Awka, Nigeria
2. Materials Chemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Nigeria
3. School of Materials Science and Engineering Sichuan University of Science and Engineering, Sichuan Province, PR China
4. Department of Mechanical Engineering, Federal University of Petroleum Resources Effurun, Ugbomoro, Nigeria
5. Department of Pure and Industrial Chemistry, University of Nigeria Nsukka, 410001 Nigeria
6. Department of Chemistry, Faculty of Mathematical and Physical Science, University College London, London WC1E 6BT, UK