1. Department of Materials Science Fudan University Shanghai 200433 P. R. China
2. Frederick Seitz Materials Research Laboratory Department of Materials Science and Engineering Department of Chemistry University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
3. State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics International Research Center for Computational Mechanics Dalian University of Technology Dalian 116024 P. R. China
4. School of Electrical and Computer Engineering Purdue University West Lafayette IN 47907 USA
5. School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea
6. AML, Department of Engineering Mechanics Center for Mechanics and Materials Tsinghua University Beijing 100084 China
7. Department of Mechanical Engineering Department of Civil and Environmental Engineering and Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
8. Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 USA
9. Department of Materials Science and Engineering Department of Biomedical Engineering Department of Neurological Surgery Department of Chemistry Department of Mechanical Engineering Department of Electrical and Computer Science Center for Bio‐Integrated Electronics Simpson Querrey Institute for Nano/biotechnology Northwestern University Evanston IL 60208 USA