Date: Tuesday, Mar 16th
Presenter: Rod Ruoff, Cockrell Family Regents Chair, Dept of Mechanical Engineering and the Texas Materials Institute, The University of Texas at Austin
Thermal chemical vapor deposition was used to grow graphene on copper substrates  and isotopic labeling (13C vs 12C ) was used to study how graphene grows on Cu . Graphene holds potential as a transparent electrically conductive thin film [4a, b, c] and for electrical energy storage (e.g.,,graphene-based ultracapacitors ). Our top-down approaches [6,7] were the first to target obtaining individual layers of graphite obtained by micromechanical exfoliation. In another research path, graphite is converted to graphite oxide (GO) to generate aqueous colloidal suspensions containing platelets of ?graphene oxide? that have been used in a variety of ways, such as for making composites with polymers  and silica , and to form ?paper-like? materials ; time permitting, I will revisit such pioneering contributions that depend on preparing chemically modified graphenes as colloids .
Support of our work by the DARPA CERA program, SWAN NRI program (SRC), the state of Texas, UT Austin, and prior support by NASA and the NSF, is appreciated. Recent support on graphene-based ultracapacitors (NSF, DoE-SISGR, Graphene Energy Inc) as well as on graphene-based transparent conductive films (DARPA) is appreciated. Ruoff Group publications are at http://bucky-central.me.utexas.edu/publications.htm .
1. Xuesong Li, Weiwei Cai, Jinho An, Seyoung Kim, Junghyo Nah, Dongxing Yang, Richard Piner, Aruna Velamakanni, Inhwa Jung, Emanuel Tutuc, Sanjay K. Banerjee, Luigi Colombo, Rodney S. Ruoff, Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils, Science (2009), 324, 1312-1314.
2. Cai, Weiwei; Piner, Richard D.; Stadermann, Frank J.; Park, Sungjin; Shaibat, Medhat A.; Ishii, Yoshitaka; Yang, Dongxing; Velamakanni, Aruna; An, Sung Jin; Stoller, Meryl; An, Jinho; Chen, Dongmin; Ruoff, Rodney S. Synthesis and Solid-State NMR Structural Characterization of 13C-Labeled Graphite Oxide. Science (2008), 321(5897),1815-1817.
3. Xuesong Li; Weiwei Cai; Luigi Colombo; Rodney S. Ruoff. Evolution of Graphene Growth on Ni and Cu by Carbon Isotope Labeling. Nano Letters (2009).Meryl D. Stoller; Sungjin Park; Yanwu Zhu; Jinho An; Rodney S. Ruoff.
4. (a). X. S. Li, Y. W. Zhu, W. W. Cai, M. Borysiak, B. Y. Han, D. Chen, R. D. Piner, L. Colombo, R. S. Ruoff, Transfer of large-area graphene films for high-performance transparent conductive electrodes, Nano Letters, ASAP, DOI: 10.1021/nl902623y (2009). (b). Weiwei Cai, Yanwu Zhu, Xuesong Li, Richard D. Piner, and Rodney S. Ruoff. Large area few-layer graphene/graphite films as transparent thin conducting electrodes. Applied Physics Letters (2009), 95, 123115; (c). Yanwu Zhu, Weiwei Cai, Richard D. Piner, Aruna Velamakanni, and Rodney S. Ruoff. Transparent self-assembled films of reduced graphene oxide platelets. Applied Physics Letters (2009), 95, 103104.
5. Meryl D. Stoller; Sungjin Park; Yanwu Zhu; Jinho An; Rodney S. Ruoff. Graphene-Based Ultracapacitors. Nano Letters (2008), 8 (10), 3498-3502.
6. Lu XK, Yu MF, Huang H, and Ruoff RS, Tailoring graphite with the goal of achieving single sheets, Nanotechnology, 10, 269-272 (1999).
7. Lu XK, Huang H, Nemchuk N, and Ruoff RS, Patterning of highly oriented pyrolytic graphite by oxygen plasma etching, Applied Physics Letters, 75, 193-195 (1999).
8. Sasha Stankovich, Dmitriy A. Dikin, Geoffrey H. B. Dommett, Kevin M. Kohlhaas, Eric J. Zimney, Eric A. Stach, Richard D. Piner, SonBinh T. Nguyen and Rodney S. Ruoff, Graphene-based composite materials, Nature 442 (2006) 282-285.
9. Supinda Watcharotone, Dimitry A. Dikin, Sasha Stankovich, Richard Piner, Inhwa Jung, Geoffrey H. B. Dommett, Guennadi Evmenenko, Shang-En Wu, Shu-Fang Chen, Chuan-Pu Liu, SonBinh T. Nguyen, Rodney S. Ruoff. Graphene-Silica Composite Thin Films as Transparent Conductors. Nano Letters, 7(7), (2007), 1888-1892.
10. Dmitriy, A. Dikin, Sasha Stankovich, Eric J. Zimney, Richard D. Piner, Geoffrey H. B. Dommett, Guennadi Evmenenko, SonBinh T. Nguyen, Rodney S. Ruoff. Preparation and characterization of graphene oxide paper. Nature, 448, (2007), 457-460.
11. Park, Sungjin; Ruoff, Rodney S. Chemical methods for the production of graphenes. Nature Nanotechnology (2009), 4, 217-224.
Prior to joining The University of Texas at Austin as a Cockrell Family Regents Chair in Mechanical Engineering and Materials Science and Engineering, Prof. Rod Ruoff served as Director of the Biologically Inspired Materials Institute at Northwestern University. He has been a ?Visiting Chair Professor? at Sungkyunkwan University in South Korea. He received his B.S. in Chemistry from the U. of Texas (Austin) and Ph.D. from the University of Illinois-Urbana. He was a Fulbright Fellow at the Max Planck Institute-Goettingen, Germany. From ?89-?90, he was a Postdoctoral Fellow at the IBM T. J. Watson Research Center in New York. Prior to joining Northwestern in 2000, he was a Staff Scientist at the Molecular Physics Laboratory of SRI International and Associate Professor of Physics at Washington University. His research interests and activities include global environment and energy-related issues; synthesis and physical/chemical properties of nanostructures and composites; technology development, and developing new tools for biomedical research. Prof. Ruoff has published 215 refereed journal articles in the fields of chemistry, physics, mechanics, and materials science. He is a co-founder of Graphene Energy, Inc., and the founder of Nanode, Inc.