1. Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
2. Department of Civil and Environmental Engineering and Mechanical Engineer; Center for Engineering and Health and Skin Disease Research Center; Northwestern University; Evanston IL 60208 USA
3. Department of Engineering Mechanics; Center for Mechanics and Materials; Tsinghua University; Beijing 100084 China
4. State Key Laboratory of Electronic Thin Films and Integrated Devices; University of Electronic Science and Technology of China; Chengdu Sichuan 610054 China
5. Department of Chemistry; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
6. MC10, Inc.; Cambridge MA 02140 USA
7. Department of Civil and Environmental Engineering and Mechanical Engineering; Northwestern University; Evanston IL 60208 USA
8. Department of Materials Science and Engineering; Chemistry, Mechanical Science and Engineering; Electrical and Computer Engineering; Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials; Research Laboratory; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA