1. Green Electronic Nanomaterials Group, School of Materials and Mineral Resources Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia
2. Department of Electrical Engineering, School of Electrical Engineering, Telkom University, Jl. Telekomunikasi No. 1, Bandung 40257, Indonesia
3. Institute of Liberal Arts & Sciences, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan
4. Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology, Toyohashi, Aichi 441-8580, Japan