1. Advanced Nano Materials (ANoMa) Research Group, Faculty of Science and Marine Environment, Universiti Malaysia Terengganu, Malaysia
2. Department of Mechanical Engineering, Micro- and Nanoanalytics Group, University of Siegen, Siegen, Germany
3. Department of Physics, Faculty of Science, Universiti Putra Malaysia, Serdang, Malaysia
4. Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, Serdang, Malaysia
5. Department of Chemistry and Biology, Physical Chemistry I & Research Center of Micro and Nanochemistry and Engineering (Cμ), University of Siegen, Siegen, Germany
6. Department of Physics, College of Natural Sciences, Jeonbuk National University 567, Jeonju-si, Republic of Korea