1. Department of Chemical Engineering Calcutta Institute of Technology Banitabla Uluberia Howrah West Bengal 711316 India
2. Centre for Nanostructures and Advanced Materials DSI‐CSIR Nanotechnology Innovation Centre Council for Scientific and Industrial Research Pretoria 0001 South Africa
3. Department of Chemical Sciences University of Johannesburg Doornfontein Johannesburg 2028 South Africa