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Nanoscale carbon blacks produced by CO2 laser pyrolysis

Published online by Cambridge University Press:  03 March 2011

Xiang-Xin Bi*
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511-8433 and Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
M. Jagtoyen
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511-8433
M. Endo
Affiliation:
Faculty of Engineering, Shinshu University, Nagano-city 380, Japan
K. Das Chowdhury*
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
R. Ochoa
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511-8433
F.J. Derbyshire
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511-8433
M.S. Dresselhaus
Affiliation:
Department of Electrical Engineering and Computer Science and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
P.C. Eklund
Affiliation:
Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky 40511-8433 and Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506
*
a)Present address: International Center for Materials Research, 750 Enterprise Dr., Lexington, Kentucky 40511.
b)Present address: Intel Corp., 4100 Sara Rd., Rio Rancho, New Mexico 87124.

Abstract

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CO2 laser pyrolysis has been used to synthesize carbon black (particle diameter ∼30 nm) via a catalytically driven pyrolysis of benzene vapor. The H : C ratio is found to be ∼1 : 10, which is unusually high for carbon blacks. Subsequent heat treatment of the “laser black” to temperatures up to ∼2800 °C produces well-graphitized faceted particles with central polygonal cavities. High resolution TEM lattice imaging, Raman scattering, and x-ray diffraction have been used to characterize the morphological structure of these carbon particles in their as-synthesized and heat-treated forms. Furthermore, KOH treatment at ∼800 °C has been employed to activate the as-synthesized particles, producing a tenfold increase in the surface area from 50 to 700 m2/g. Possible pore structures generated during this activation process have been identified by high resolution TEM imaging.

Type
Articles
Copyright
Copyright © Materials Research Society 1995

References

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