1. School of Chemical Sciences, Universiti Sains Malaysia , 11800 Minden , Penang , Malaysia
2. Department of Chemistry, Federal College of Education Technical Gombe , P.M.B. 060 , Gombe , Gombe State , Nigeria
3. Nanomaterials Research Group, School of Chemical Sciences, University Sains Malaysia , 11800 Minden , Penang , Malaysia
4. School of Materials and Minerals Resources Engineering, Engineering Campus, Universiti Sains Malaysia , 14300 Nibong Tebal , Pulau Pinang , Malaysia
5. Faculty of Chemical Engineering Technology, Universiti Malaysia Perlis (UniMAP) , Perlis , Malaysia