Showing papers by "David J. Heeger published in 1983"
TL;DR: In this paper, the effects of irradiation by energetic carbon ions (56 MeV 6+) on the transport properties of polyacetylene is presented. But the results of the analysis are limited.
Abstract: A study of the effects of irradiation by energetic carbon ions (56 MeV C6+) on the transport properties of polyacetylene is presented. The in situ monitoring of the resistivity ρ shows an initial nonlinear increase by a factor of 104 as a function of the integrated flux of particles Φ. For trans‐(CH)x, the increase in ρ saturates at a plateau starting at Φ0≂5×1012 particles/cm2, whereas trans‐(CD)x behaves differently. After a similar (but slower) initial increase, ρ of trans‐(CD)x peaks at Φ0 and subsequently decreases for Φ≳Φ0. Parallel thermoelectric power data show an increase from ∼880 μV/K to ∼1100 μV/K for Φ≂Φ0 for both isotopes. Characterization studies of the irradiated film using infrared and Raman spectroscopy show no detectable change in backbone structure, and ESR measurements show no increase in the number of unpaired spins. Moreover, after irradiation the polymer can be doped to the highly conducting metallic regime. We therefore conclude that the conjugted (CH)x chains remain intact during...