Abstract
The electrical resistance decrease during the intercalation of high modulus ex-PAN graphite fibers with some strong acceptors (AsF 5, SbF 5, SO 3, HSO 3F) and their mixtures was determined at 22–90 °C. The room temperature resistance change took place in two steps — first, a relatively rapid decrease to at least half the initial value within a few days, followed by a slow decay for many days. Heating at 60 – 90 °C greatly accelerates the equilibration. Conductance increases up to 36 times were observed, corresponding to a conductivity gain of ∼ 15× and specific conductivity ∼ 40% that of copper. The temperature coefficient of the resistance was quite small, < 3 × 10 −4 °C −1. The intercalated fibers retained their conductance during 100 h of current aging at 25 – 35 A/mm 2 and 1 watt power dissipation. Conductor “wires”, up to 30 cm long, equivalent in size to 17 – 18 AWG metal wire, and stable to 100 °C, were made by providing graphite fiber bundles with metallic terminals, encapsulating in a Teflon® sheath, and intercalating with AsF 5.
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