1. Environmental Science and New Energy Technology Engineering Laboratory, Shenzhen Geim Graphene Center (SGGC), and Tsinghua-Berkeley Shenzhen Institute (TBSI), Tsinghua University, Shenzhen 518055, China
2. Department of Materials Science and Engineering, University of California, Berkeley, California 94720, United States
3. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
4. National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
5. Department of Engineering Mechanics, Zhejiang University, Hangzhou 310027, China
6. Institute of Materials Research and Shenzhen Geim Graphene Center (SGGC), Shenzhen International Graduate School (SIGS), Tsinghua University, Shenzhen 518055, China
7. Laboratory of Advanced Materials, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China