1. Shaanxi Joint Lab of Graphene, Institute of Photonics & Photon-Technology, School of Physics, Northwest University, Xi’an 710069, China
2. School of Information Science and Technology, Northwest University, Xi’an 710127, China
3. Frontiers Science Center for Flexible Electronics, Xi’an Institute of Flexible Electronics (IFE) and Xi’an Institute of Biomedical Materials & Engineering, Northwestern Polytechnical University, Xi’an 710072, China
4. School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
5. Centre for Micro-/Nano-Electronics (NOVITAS), School of Electrical & Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
6. CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza, 50 Nanyang Drive, Singapore 637553, Singapore