a
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, and Biomedical Materials and Engineering Center, Wuhan University of Technology, Wuhan 430070, China
b
Department of Mechanical Engineering and the Materials Science and Engineering Program, The University of Texas at Austin, 1 University Station C2200, Austin, USA
E-mail: r.ruoff@mail.utexas.edu
c
Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station A1590, Austin, USA
E-mail: bielawski@cm.utexas.edu
d
School of Computational Sciences, Korea Institute for Advanced Study, Seoul 130-722, Korea
e
World Class University (WCU) Program of Chemical Convergence for Energy & Environment (C2E2), School of Chemical and Biological Engineering, Seoul National University, Seoul 151-742, Korea