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Intercalation of Acceptors and Donors in Highly Ordered Graphite Fibers

Published online by Cambridge University Press:  15 February 2011

T.C. Chieu ,
G. Timp  and
M.S. Dresselhaus
T.C. Chieu
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA M. ENDO, Shinshu University, Nagano 380, Japan
G. Timp
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA M. ENDO, Shinshu University, Nagano 380, Japan
M.S. Dresselhaus
Affiliation:
Massachusetts Institute of Technology, Cambridge, MA 02139, USA M. ENDO, Shinshu University, Nagano 380, Japan
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Abstract

The intercalation of various acceptors and donors into graphite fibers, prepared from benzene-derived precursor materials is investigated by Raman spectroscopy, x-ray diffraction, electron diffraction, lattice fringing, and electrical resistivity measurements. Evidence for formation of well-staged acceptor compounds is provided by Debye-Scherrer x-ray diffraction which probes the bulk fiber and by Raman spectroscopy which probes an optical skin depth (< 0.1 μm). Lattice fringing measurements provide direct observation of large regions (up to 50 Aring; × 400 Aring;) of defectfree single-staged regions. Values for the c-axis repeat distance Ic are obtained by indexing (00l) lines of the x-ray diffraction pattern. Raman results show characteristic upshifted modes for stage 1 acceptor compounds with a sharpening in linewidth as compared to the E2g2 mode of the pristine fiber. The room temperature electrical conductivity is increased about an order of magnitude upon intercalation and exhibits a metallic dependence on temperature. The highest air-stable room temperature conductivity 1.4 × 105 (Ω-cm)−l ever reported for an intercalated fiber has been achieved.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 20: Symposium H – Intercalated Graphite , 1982 , 51
Copyright
Copyright © Materials Research Society 1983

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References

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