Photoabsorption and desorption studies on poly-3-hexylthiophene/multi-walled carbon nanotube composite films

Aráujo, G.; Arantes, C.; Roman, Lucimara S.; Zarbin, Aldo J. G.; Rocco, Maria Luiza M.

doi:10.1016/j.susc.2009.01.002

Cited by 12 publications

(9 citation statements)

References 62 publications

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“…Following the well-known assignment for gas-phase thiophene, the first intense peak, labeled as (B) in Figure a, is due to the overlapping of the S 1s → π* and S 1s → σ*(S–C) transitions, which lie very close in energy. The other minor features correspond to higher energy excitations probably containing Rydberg character and above sulfur 1s ionization potential σ*(C–C) shape resonances are expected. , Similar features were observed in XAS spectra of poly(3-methylthiophene) and poly(3-hexylthiophene) . No molecular orientation was measured here.…”

Section: Resultssupporting

confidence: 76%

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Femtosecond Electron Delocalization in Poly(thiophene) Probed by Resonant Auger Spectroscopy

et al. 2013

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Ultrafast electron dynamics in the low-femtosecond regime was evaluated for poly(thiophene) by resonant Auger spectroscopy using the corehole clock method. Sulfur KL 2,3 L 2,3 Auger decay spectra were measured as a function of the photon energy. Remarkable changes developed by tuning the photon energy along the sulfur 1s absorption edge, depending on the nature of the intermediate core excited states. Features characteristics of the Auger Resonant Raman effect were observed. Competition between core hole decay and delocalization of the photoexcited electron was monitored. Branching ratios of Raman (spectator) and normal Auger channels were calculated and electron delocalization times derived.

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Section: Resultssupporting

confidence: 76%

“…26,27 Similar features were observed in XAS spectra of poly(3-methylthiophene) 28 and poly(3-hexylthiophene). 29 No molecular orientation was measured here. Clear angular dependence of NEXAFS spectra was demonstrated for thiophene-based polymers prepared by doctor blade casting.…”

Section: Resultsmentioning

confidence: 99%

Femtosecond Electron Delocalization in Poly(thiophene) Probed by Resonant Auger Spectroscopy

et al. 2013

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“…The spectra are similar to previously reported X-ray absorption data on thiophene-based polymers: polythiophene (PT), [44][45][46] poly-3-methylthiophene (P3MT), 47 and also P3HT and P3HT/Fe-MWCNT nanocomposite (with 10% of Fe-MWCNT). 48 It presents an intense peak, which was assigned to the overlapping of the S 1s / p* and S 1s / s*(S-C) transitions, followed by weak structures. This is a well establish assignment corroborated by resonant Auger spectroscopy (RAS) tuned around S 1s edge for polythiophene 45,46 and also by recent theoretical calculations.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast interface charge transfer dynamics on P3HT/MWCNT nanocomposites probed by resonant Auger spectroscopy

et al. 2018

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“…In conducting polymers the excitons are short-lived and tend to recombine before the charge collection at the electrodes . The dissociation of excitons can be promoted at the interface of a heterojunction between semiconductor materials of different electron affinities . Conducting polymers (electron donor, D) and fullerenes (electron acceptor, A) are extensively employed to generate a heterojunction .…”

Section: Introductionmentioning

confidence: 99%

Conducting Polymer/SWCNTs Modular Hybrid Materials via Diels–Alder Ligation

et al. 2013

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The development of a facile covalent strategy for the fabrication of organic conducting polymers (OCPs)/carbon nanotubes (CNTs) based molecular hybrid materials remains a challenge and is expected to address the detrimental intrinsic bundling issue of CNTs. In view of the pristine CNTs’ ability to undergo Diels–Alder reactions with dienes, we report the synthesis of a novel poly(3-hexylthiophene) (P3HT) based organic conducting polymer (OCP) with terminal cyclopentadienyl (Cp) groups. The synthetic strategy employed is based on a combination of in situ end group functionalization via Grignard metathesis (GRIM) polymerization and a subsequent end group switching via reaction with nickelocene. Characterization data from Matrix-assisted laser desorption-ionization time-of-flight mass spectrometry (MALDI–TOF MS) fully support the successful synthesis of monofunctional Cp-capped P3HT, which was found to be highly reactive toward dienophile end-capped polystyrene (PS). The Cp-capped P3HT was subsequently ligated to the surface of pristine single walled CNTs (SWCNTs). The resulting P3HT/SWCNTs molecular hybrid material was characterized using thermogravimetric analysis (TGA), elemental analysis (EA), X-ray photoelectron spectroscopy (XPS), and high resolution transmission electron microscopy (HRTEM). The data from TGA, EA, and XPS were used to quantitatively deduce the grafting density. P3HT/SWCNTs prepared with Cp capped P3HT was found to contain 2 times more P3HT than the reference sample, featuring a grafting density of 0.0510 chains·nm–2 and a periodicity of 1 P3HT chain per 748 carbon atoms of the SWCNTs. HRTEM revealed individual SWCNTs wrapped with P3HT whereas in the reference sample P3HT was adsorbed on the bundles of the SWCNTs. The results presented here provide a new avenue for designing novel materials based on CNTs and OCPs.

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Photoabsorption and desorption studies on poly-3-hexylthiophene/multi-walled carbon nanotube composite films

Cited by 12 publications

References 62 publications

Femtosecond Electron Delocalization in Poly(thiophene) Probed by Resonant Auger Spectroscopy

Femtosecond Electron Delocalization in Poly(thiophene) Probed by Resonant Auger Spectroscopy

Ultrafast interface charge transfer dynamics on P3HT/MWCNT nanocomposites probed by resonant Auger spectroscopy

Conducting Polymer/SWCNTs Modular Hybrid Materials via Diels–Alder Ligation

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