Conducting polypyrrole (PPy) nanowires (NWs) were irradiated by a relatively high energy (300 keV-2 MeV) electron-beam (e-beam) generated from a linear electron accelerator in an atmospheric environment. From the current-voltage characteristics of pristine and 2 MeV e-beam irradiated PPy NWs, we observed a dramatic variation in resistance from 8.0× 102 to 1.45× 108 Ω, that is, we observed a transition from conducting states to nonconducting states through the e-beam irradiation. To discern conformational changes and the doping states of PPy NWs through the e-beam irradiation, we measured Raman and ultraviolet-visible absorption spectra for the PPy NWs. As the energy of the e-beam irradiation increased, we observed that the PPy NWs were changed from doping states to dedoping states with conformational modification including the variation in π -conjugation length.
Bibliographical noteFunding Information:
This work was supported in part by the Korean Science and Engineering Foundation (KOSEF) grant funded by the Korean government (MEST) (Grant Nos. M20802000221-08B0200-22110 and R0A-2007-000-20053-0).
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)