1. Nanotechnology Engineering, Faculty of Advanced Technology and Multidiscipline, Universitas Airlangga, Surabaya 60115, Indonesia
2. Research Center for Advanced Materials, National Research and Innovation Agency (BRIN), South Tangerang, Banten 15315, Indonesia
3. Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya 60111, Indonesia
4. Department of Electrophysics, National Yang Ming ChiaoTung University, Hsinchu 30010, Taiwan