Energy, Sensors and Multifunctional Nanomaterials Research Group, Department of Applied Chemistry, University of Johannesburg, Doornfontein 2028, Johannesburg, South Africa; Chemistry Department Faculty of Applied and Computer Science, Vaal University of Technology, Vanderbijlpark Campus, Boulevard, 1900, Vanderbijlpark, South Africa. Electronic address: lawalishaq000123@yahoo.com.