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Electronic resistivity of carbon in the product of electrochemical reduction of poly(tetrafluoroethylene), I

✍ Scribed by Ladislav Kavan; František P. Dousek; Karel Micka; Jan Weber

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
827 KB
Volume
26
Category
Article
ISSN
0008-6223

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✦ Synopsis

The product of electrochemical reduction of poly(tetrafluoroethylene) (a mixture of elemental carbon and LiF) is an electronic conductor with a time-dependent resistivity, whose value at room temperature decreases by one to two orders of magnitude within one year after the preparation. This decrease is accompanied by recrystallization of LiF and probably by gradual cross-linking of linear carbon chains in the sp state, which are the primary reduction product of the polymer. The temperature dependence of the resistivity satisfies the Mott "T-"J law," evidence for the electron-hopping mechanism. The electronic resistivity increases abruptly on exposition to air and also by injection of Li+ ions, the latter effect being reversible.

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