Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 5, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3077589
Keywords
conducting polymers; electrical resistivity; electron beam effects; nanowires; Raman spectra; semiconductor doping; semiconductor quantum wires; ultraviolet spectra; visible spectra
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Funding
- Korean government (MEST) [M2080200022108B0200-22110, R0A-2007-000-20053-0]
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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 8.0x10(2) to 1.45x10(8) Omega, 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 pi-conjugation length.
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