1. Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory University of Illinois at Urbana–Champaign Urbana IL 61801 USA
2. Center for Bio‐Integrated Electronics at the Simpson Querrey Institute for BioNanotechnology and the Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
3. Washington University Pain Center and Department of Anesthesiology Washington University School of Medicine St. Louis MO 63110 USA
4. Department of Bioengineering University of Illinois at Urbana–Champaign Urbana IL 61801 USA
5. CREOL The College of Optics and Photonics and NanoScience Technology Center University of Central Florida Orlando FL 32826 USA
6. School of Materials Science and Engineering Tsinghua University Beijing 100084 China
7. School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea
8. Department of Electronic Engineering Tsinghua University Beijing 100084 China
9. Center for Bio‐Integrated Electronics Departments of Materials Science and Engineering, Biomedical Engineering, Chemistry, Mechanical Engineering, Electrical Engineering and Computer Science, and Neurological Surgery Simpson Querrey Institute for Nano/Biotechnology McCormick School of Engineering and Feinberg School of Medicine Northwestern University Evanston IL 60208 USA