1. Department of Materials Science Fudan University Shanghai 200433 P. R. China
2. Frederick Seitz Materials Research Laboratory Department of Materials Science and Engineering University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
3. Department of Electrical and Computer Engineering Northeastern University Boston MA 02115 USA
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. Department of Physics Duke University Durham NC 27708 USA
7. Department of Mechanical Engineering Civil and Environmental Engineering and Materials Science and Engineering Northwestern University Evanston IL 60208 USA
8. Departments of Materials Science and Engineering Biomedical Engineering Neurological Surgery Chemistry Mechanical Engineering Electrical Engineering and Computer Science Northwestern University Evanston IL 60208 USA
9. Center for Bio‐Integrated Electronics Northwestern University Evanston IL 60208 USA
10. Simpson Querrey Institute for Nano/Biotechnology Northwestern University Evanston IL 60208 USA