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 Å × 400 Å) 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)−1 ever reported for an intercalated fiber has been achieved.
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Chieu, T.C., Timp, G., Dresselhaus, M.S. et al. Intercalation of Acceptors and Donors in Highly Ordered Graphite Fibers. MRS Online Proceedings Library 20, 51 (1982). https://doi.org/10.1557/PROC-20-51
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DOI: https://doi.org/10.1557/PROC-20-51