Polymer films darken upon irradiation with energetic ion beams. At high doses (1016-1017 cm- 2) of 2-MeV Ar+ ions, the resistivity of these insulating films decreases dramatically to 3.5×10-3 Ω cm. Furthermore, over a wide range of doses (1014-10 15 cm-2) these films exhibit a temperature-dependent resistivity characteristic of carrier transport via hopping between isolated conducting islands. Rutherford backscattering measurements indicate that while a substantial amount of the carbon is retained in the film, other constituent elements are lost. Raman spectra show that the films are highly disordered at large ion doses.
ASJC Scopus subject areas
- Physics and Astronomy(all)