Thermal chemical vapor deposition has been used to grow graphene on copper substrates [1] and isotopic labeling (13C vs 12C) to study the kinetics and mechanisms of the graphene growth on Cu [2]. This talk presents a suggested path for obtaining large area growth of high quality graphene in ways compatible with methods of the semiconductor industry. Furthermore, I will discuss graphene and EDLC (electrochemical double layer capacitance) and thus graphene-based ultracapacitors[3], and use of graphene as a transparent electrically conductive thin film [4]. Our top-down approaches [5,6] inspired physicists to study individual layers of graphite obtained by micromechanical exfoliation, and one of our current approaches has been to convert graphite to graphite oxide (GO), generate aqueous colloidal suspensions containing individual layers of GO (we call them ‘graphene oxide’), and to use these ‘graphene oxide sheets’ in a variety of ways, such as for making composites with polymers [7], silica [8], and ‘paper-like’ materials [9]. Time permitting, I will briefly revisit our pioneering contributions in these areas as well.
Support of our work by DARPA, the state of Texas, UT Austin, and prior support by NASA and the NSF, is appreciated. Recent support on graphene-based ultracapacitors (NSF and DoE-SISGR) 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. 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. Graphene-Based Ultracapacitors.
3. Meryl D. Stoller; Sungjin Park; Yanwu Zhu; Jinho An; Rodney S. Ruoff. Graphene-Based Ultracapacitors. Nano Letters (2008), 8 (10), 3498-3502.
4. Submitted to Nano Letters. Also: 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; and 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. Lu XK, Yu MF, Huang H, and Ruoff RS, Tailoring graphite with the goal of achieving single sheets, Nanotechnology, 10, 269-272 (1999).
6. 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).
7. 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.
8. 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.
9. 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.
BIOGRAPHY
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; transitioning scientific breakthroughs to technology, and developing new tools for biomedical research. Prof. Ruoff has published about 210 refereed journal articles in the fields of chemistry, physics, mechanics, & materials science. He is a co-founder of Graphene Energy, Inc., and the founder of Nanode, Inc.
Hosted by: Prof. Frenklach, 6105B Etcheverry Hall, 643-1676, myf@me.berkeley.edu
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