1. School of Applied Physics, Faculty of Science and Technology; Universiti Kebangsaan Malaysia; 43600 Bangi Selangor Malaysia
2. Material Technology Group, Industrial Technology Division; Malaysian Nuclear Agency; Bangi 43300 Kajang Selangor Malaysia
3. Institute for Nanomaterials, Advanced Technologies and Innovation, Department of Nanotechnology and Informatics; Technical University of Liberec; Studentska 1402/2 46117 Liberec The Czech Republic