1. Department of Electrical and Computer Engineering Frederick Seitz Materials Research Laboratory University of Illinois at Urbana‐Champaign Urbana IL 61801 USA
2. Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
3. Department of Materials Science and Engineering University of Central Florida Orlando FL 32816 USA
4. Department of Anesthesiology Washington University Pain Center Washington University School of Medicine St. Louis MO 63130 USA
5. Department of Mechanical Engineering Department of Civil and Environmental Engineering Department of Materials Science and Engineering Northwestern University Evanston IL 60208 USA
6. Department of Neurological Surgery Washington University School of Medicine St Louis MO 63110 USA
7. Center for Bio‐Integrated Electronics Department 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