Effects of electron-beam irradiation on conducting polypyrrole nanowires

Abstract

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.

Enhanced Electrical Conductivity of Individual Conducting Polymer Nanobelts

“…One reason for this is the easy aggregation of 1D polymer nanostructures in solution, while dispersed polymer nanostructures are a prerequisite for applications based on individual nanowires 3. Another is the difficulty of manipulating and positioning 1D conducting polymer in nanodevices because the lithography processing (e.g., electron‐beam (e‐beam) and focused ion beam) inevitably deteriorates the conducting polymer's properties 7, 8…”

“…As shown in Figure 3b, the full width at half maximum (FWHM) for the symmetric C=C stretching mode at 1580 cm −1 became smaller as the width of the nanobelts decreased. The Raman peak narrowing might be attributed to the variation in the π‐conjugation length of the PPy chains, which is associated with the π‐electron delocalization 8, 24. This indicates that narrowing nanobelts might reduce defects and distortions in the PPy main chains, thereby resulting in the increasing coplanarity of the aromatic ring and π‐conjugation length 8.…”

Massive, eco-friendly, and facile fabrication of multi-functional anodic aluminum oxides: application to nanoporous templates and sensing platforms

“…6e and inset of Fig. 6f were a typical feature observed in the PPy NWs, 74 and transmission electron microscope (TEM) image shown in the inset of Fig. 6e proved the formation of NW with completely lled inside.…”

“…7d, indicating the reduction of the p-conjugation length due to the conne synthesis within relatively narrow volume of the fabricated AAOs. 8,74 In addition, the doping-induced bipolaron band was signicantly decreased for the P3MT NWs with an averaged diameter of $25 nm, which could be utilized as active components in optoelectronic applications without further dedoping treatments 68 (e.g., electrochemical reduction-oxidation 7 or electron-beam irradiation, 8,9,74 etc.). These result could be attributed to the dopants-assisted electrochemical polymerization mechanism 75 and enhancement of the surface area resulted from the smaller diameters of the AAO, which could enable the dopant ions intercalated between the polymeric chains smearing out more easily by the counter ions (e.g., OH À ) exchanging effects during dedoping phenomena.…”

The Influence of Platinum on the Structure and Photocatalytic Performance of Hydrogen Titanate Nanotubes

“…Due to quick recombination of photo-generated charges, the photocatalytic efficiency of pure TiO 2 is not high enough [4,5] , which limits its practical application greatly. In the field of improving photocatalytic performance and efficiency of TiO 2 , many works on TiO 2 modified with noble metal, metal sulfide, various dopants, etc have been reported [5][6][7][8][9][10][11][12] . It has been proved that photocatalytic performance of TiO 2 modified with noble metals is better than that of primary TiO 2 .…”