1. College
of Mechanics and Materials, Hohai University, Nanjing, Jiangsu 210098, China
2. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University (Nanjing Tech), 30 South Puzu Road, Nanjing, Jiangsu 211816, China
3. School
of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
4. Department
of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States