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 Electrical Engineering; University of Illinois at Urbana-Champaign; Urbana IL 61801 USA
3. Department of Mechanical Engineering; Pohang University of Science and Technology; Pohang 790-784 Republic of Korea
4. Department of Dermatology, Feinberg School of Medicine; Northwestern University; Chicago IL 60611 USA
5. I. Na; Department of Chemical Engineering; Pohang University of Science and Technology; Pohang 790-784 Republic of Korea
6. Department of Civil and Environmental Engineering, Department of Mechanical Engineering; Center for Engineering and Health and Skin Disease Research Center, Northwestern University; Evanston IL 60208 USA
7. Center for Mechanics and Materials; Tsinghua University Beijing 100084 China
8. Institute of High Performance Computing; A*star, 1 Fusionopolis Way, #16-16 Connexis 138632 Singapore
9. Department of Electronic Engineering; Pusan National University Busan 609-735 Republic of Korea
10. Department of Mechanical and Nuclear Engineering and Institute for Engineering and Medicine; Virginia Commonwealth University; Richmond VA 23284 USA
11. Department of Materials Science and Engineering; Beckman Institute for Advanced Science and Technology and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign; Urbana IL 61801 USA