1. Nano Center Indonesia, Jalan Raya PUSPIPTEK, South Tangerang, Banten 15314, Indonesia
2. Department of Mechanical Engineering, Mercu Buana University, Jl. Meruya Selatan, Kebun Jeruk, Jakarta 11650, Indonesia
3. Research Center for Advanced Materials, National Research and Innovation Agency, Kawasan Puspiptek Serpong gd. 440-441, South Tangerang, Banten 15314, Indonesia
4. Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
5. NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456, Singapore
6. Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore