Preparation of Gold Nanoparticles on Ultrathin Films of Polythiophene and Polythiophene Derivatives

Intelmann, C. M.; Dietz, H.; Plieth, W.

doi:10.1002/ejic.200500395

Cited by 6 publications

(6 citation statements)

References 18 publications

(25 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effect can be understood, in part, in terms of the structural changes that accompany the oxidation of the polymer. The P3HT chains are oxidized in the HAuCl 4 solution, , as shown in Scheme , which results in a new chain conformation. The chemical structure of the oxidized P3HT chains changes from a benzoid to a quinoid structure.…”

Section: Resultsmentioning

confidence: 99%

“…In particular, the spin-coating method cannot produce nanowire morphologies with molecularly ordered structures, unlike the solvent-dropping method, because of fast solvent evaporation rates. Furthermore, when polymer FETs are exposed to air, they tend to degrade easily, limiting the lifetime of polymer devices. − Therefore, many groups have tried to enhance the molecular ordering of conducting polymer films ,,,− and their electrical properties through doping ,− or to improve the stability through encapsulation. , …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhancement of Field-Effect Mobility and Stability of Poly(3-hexylthiophene) Field-Effect Transistors by Conformational Change

et al. 2008

View full text Add to dashboard Cite

With the aim of enhancing the field-effect mobility and air stability of self-aligned regioregular poly(3-hexylthiophene), P3HT, by promoting two-dimensional molecular ordering, we transformed the chemical structure of the P3HT chain from a benzoid to a quinoid structure by doping the P3HT solution with HAuCl 4 prior to film formation. We found that, for the appropriate HAuCl 4 concentration, the P3HT nanocrystals adopt a highly ordered molecular structure with a field-effect mobility of 0.03 cm 2 V -1 s -1 , which is an improvement by a factor of more than 100. This increase in field-effect mobility is due to a significant enhancement of molecular ordering and the perpendicular orientation of the nanocrystals with respect to the insulator substrate. This resulted from the change in the P3HT chain conformation from a benzoid to a quinoid structure due to oxidation by HAuCl 4 . The quinoid structure favors a linear or expanded-coil conformation, so the thiophene inter-ring bonds have increased double-bond character, which improves the molecular ordering. Furthermore, the electrical properties of a doped P3HT device had highly improved stability to air without encapsulation. These results suggest that the effect of unintentional doping by oxygen on HAuCl 4 -doped P3HT film is insignificant because the p-type doping effect of HAuCl 4 is the major contributor.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancement of Field-Effect Mobility and Stability of Poly(3-hexylthiophene) Field-Effect Transistors by Conformational Change

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Composite materials with ordered structures consisting of conducting polymers and metal nanoparticles are of great interest and promising for further applications in micro-and optoelectronics. Intelmann et al 99 prepared AuNPs on ultrathin films of polythiophene and polythiophene derivatives. The ultrathin films of polythiophene derivatives bearing hydroxyl groups were esterified with thioctic acid that contained a dithiolane moiety.…”

Section: Post-modification Of Pre-formed Aunpsmentioning

confidence: 99%

Recent advances in polymer protected gold nanoparticles: synthesis, properties and applications

2007

View full text Add to dashboard Cite

show abstract

“…The P3HT chains are oxidized in the HAuCl 4 solution, as shown in Scheme 1, which results in a chain conformation. 21,22 The chemical structure of the P3HT chains changes from benzoid to quinoid upon oxidation. 23 The benzoid structure favors a random-coil conformation, whereas the quinoid structure favors a linear or expanded-coil conformation.…”

Section: Resultsmentioning

confidence: 99%

Effect of HAuCl[sub 4] Doping on the Contact Properties of Polymer Thin-Film Transistors

Park

Lim

Kwak

et al. 2009

Electrochem. Solid-State Lett.

View full text Add to dashboard Cite

We show that the electrical properties of polymer thin-film transistors can be enhanced by doping poly͑3-hexylthiophene͒ ͑P3HT͒ with HAuCl 4 . Specifically, the addition of HAuCl 4 causes an increase in the two-dimensional molecular ordering of P3HT and a remarkable reduction in the contact resistance at the electrode/semiconductor interface with no pre-or post-treatment process. This phenomenon is understood in terms of broadening of the transport manifold in the organic semiconductor, induced by HAuCl 4 , which results in a reduction in the hole-injection barrier and an enhancement of the interfacial stability at the contact between the printed electrode and the semiconductor layers.Organic field-effect transistors ͑OFETs͒ have stimulated considerable interest because of their many possible applications in low cost, large-area electronics, including flexible paperlike displays, woven electrotextiles, low cost identification tags and so on. 1-8 In the operation of OFETs, charge carrier transport is strongly dependent on the properties of two kinds of interfaces, namely, the interfaces between semiconductors and electrodes ͑where charge injection occurs from the electrodes to the semiconductors 9,10 ͒ and the interfaces between semiconductors and insulators ͑where charge transport takes place within the semiconductor layer͒. These interfacial properties determine the device performance. Recently, the electrical performance of thin-film transistors was limited by the properties of the electrode/semiconductor interface. 11-13 These findings indicate that the contact resistances of the source/drain ͑S/D͒ electrodes are important in determining the device performance. The injection at the metal/semiconductor interface and the contact resistance can predominate over the channel resistance, especially when the size of the device is reduced. The doping of semiconductors was reported to be effective in reducing the contact resistance in organic and inorganic semiconductor devices. 14-18 To date, however, the contact effect of doping on the contact resistance of inkjet-printed electrodes in OFETs has received little attention.In this article, we report on the addition of HAuCl 4 to poly͑3-hexylthiophene͒ ͑P3HT͒ solutions before film formation to enhance the performance of the obtained OFETs. To clearly demonstrate the source of this improvement, we studied the molecular structure of the HAuCl 4 -doped P3HT thin films and the contact effect at the interface between the printed poly͑3,4-ethylenedioxythiophene͒ ͑PEDOT͒ electrodes doped with polystyrene sulfonic ͑PSS͒ acid, PEDOT/PSS, and the P3HT film. ExperimentalRegioregular P3HT was obtained from Rieke Metals Inc. ͑M n = 45-50 kg/mol͒. The coupling ratio of head-tail to head-head and tail-tail was estimated to be 90% by NMR integration. Hydrogen tetrachloroaurate͑III͒ trihydrate ͑HAuCl 4 ·3H 2 O͒ was used as received from Aldrich. Highly doped Si wafers were used as both the transistor substrate and the gate electrode. A thermally grown silicon dioxide ͑SiO 2 ͒ layer ͑wit...

show abstract

Preparation of Gold Nanoparticles on Ultrathin Films of Polythiophene and Polythiophene Derivatives

Cited by 6 publications

References 18 publications

Enhancement of Field-Effect Mobility and Stability of Poly(3-hexylthiophene) Field-Effect Transistors by Conformational Change

Enhancement of Field-Effect Mobility and Stability of Poly(3-hexylthiophene) Field-Effect Transistors by Conformational Change

Recent advances in polymer protected gold nanoparticles: synthesis, properties and applications

Effect of HAuCl[sub 4] Doping on the Contact Properties of Polymer Thin-Film Transistors

Contact Info

Product

Resources

About