1996
DOI: 10.1103/physrevb.53.14309
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ESR in conducting polymers: Oxygen-induced contribution to the linewidth

Abstract: The oxygen-induced ESR line broadening has been investigated in the case of the conducting polymer polyaniline in powder and in film form. Pumping under vacuum results in a narrowing of the ESR linewidth. After initial pumping various oxygen containing gases have been applied to the sample ͑pure O 2 , ambient air, dry air͒ and the linewidth has been measured as a function of time. The residual water in these gases was found to seriously affect the narrowing behavior of the linewidth. A theoretical calculation … Show more

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Cited by 96 publications
(76 citation statements)
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“…Figure 1͑a͒ shows the EPR signal of an undoped EB-PANI film at 300 K. The peak-to-peak linewidth ͑⌬H pp ͒ is 2.6 G and the g factor is 2.0031. These values are in agreement with those found in the literature, although the reported values may vary from 4 0.29 to 23 G. 12 These differences are due to magnetic interaction of polarons and the triplet state of oxygen molecules, 13 which broadens the resonance line.…”
Section: Methodssupporting
confidence: 82%
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“…Figure 1͑a͒ shows the EPR signal of an undoped EB-PANI film at 300 K. The peak-to-peak linewidth ͑⌬H pp ͒ is 2.6 G and the g factor is 2.0031. These values are in agreement with those found in the literature, although the reported values may vary from 4 0.29 to 23 G. 12 These differences are due to magnetic interaction of polarons and the triplet state of oxygen molecules, 13 which broadens the resonance line.…”
Section: Methodssupporting
confidence: 82%
“…12 Since the adsorption sites, where the polaron is centered ͑i.e., NH + ͒, are the same for O 2 and H 2 O molecules, the higher water adsorption leads to less free sites for oxygen to be adsorbed. Houzé and Nechtschein 13 proposed that H 2 O molecules are more tightly bound to the polymeric polyaniline chain than O 2 molecules, and that water acts as a shield between polarons and oxygen. Thus, as the doping level is increased, we have more delocalized polarons, and, consequently, more sites for oxygen adsorption, which will broaden the EPR signal due to dipole-dipole interactions with paramagnetic species.…”
Section: Discussionmentioning
confidence: 99%
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“…The n P values obtained are considerably lower than that, n p ≈ 0.05, estimated for polarons excited in doped polyaniline. 39 The fitting of LEPR spectra of the P3HT/bis-PCBM composite allowed us to obtain separately all terms of its effective paramagnetic susceptibility χ as contributions of mobile and localized polarons χ P and methanofullerene anion radicals χ F . Figure 3 illustrates the changes in LEPR spectra of the P3HT/bis-PCBM composite with its heating and temperature dependences of all contributions into sum χ .…”
Section: B Paramagnetic Susceptibilitymentioning
confidence: 99%
“…A positive charge of polaron is not required to be recombined with negative charge on first fullerene, it can to recombine with a charge on a subsequent counter-ion. The fullerene molecules can be considered as fast relaxing impurities, and the spin flip-flop probability p during such a collision should depend on the exchange amplitude and the frequency of polaron diffusion ω hop as 39,43 …”
Section: B Paramagnetic Susceptibilitymentioning
confidence: 99%