1. Microelectronics and Nanotechnology-Shamsuddin Research Center (MiNT-SRC), Institute of Integrated Engineering (I2E), Universiti Tun Hussein Onn Malaysia, Parit Raja, Batu Pahat Johor, Malaysia
2. Electrochemical Material and Sensor Research Group (EMaS), Faculty of Applied Science, Universiti Teknologi MARA (UiTM) Shah Alam, Shah Alam, Selangor, Malaysia
3. Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia