Electrochemistry of Alkylpyrrole Monolayers Assembled by Self-Assembly and Langmuir−Blodgett Techniques

Kim, Young Ha; Kim, Yeon-Taik

doi:10.1021/la980098j

Cited by 11 publications

(10 citation statements)

References 27 publications

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“…It has been demonstrated with a variety of systems that surface-confined monomers of conductive polymers can serve as nucleation sites for the chemical or electrochemical growth of conductive polymer films. Particular systems investigated include SAMs capped with pyrrole, [14][15][16][17][18][19][20][21][22] aniline, [23][24][25] and thiophene [26][27][28][29][30] monomers, with most of these studies having been done on silicon or gold substrates. The involvement of the surface-confined monomer units in the polymerization results in a strongly adhered, conductive polymer layer compared to what is achieved by electropolymerization from bulk solution onto an unmodified surface.…”

Section: Introductionmentioning

confidence: 99%

Growth and Morphology of Polythiophene on Thiophene-Capped Monolayers: 1. Single Component Monolayers

et al. 2002

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Thin polythiophene films were grown at a variety of oxidizing potentials by electrochemical polymerization on indium tin-oxide surfaces that were modified with a thiophene-capped, self-assembled monolayer (SAM) composed of 11-(3-thienyl)-undecyltrichlorosilane (3TUTS). The evolution of those growing films was tracked via cyclic voltammetry and infrared spectroscopy, and the surface morphology was probed with atomic force microscopy. To allow comparison, similar data were obtained for polythiophene films grown on bare indium tin-oxide (ITO) (no SAM). Our results show that 3TUTS layers can nucleate growth of polythiophene films at potentials below the oxidation potential of monomeric thiophene in solution, and the cyclic voltammetry signature is characteristic of a surface-confined, redox-reversible species; however, at these low potentials no polythiophene growth on the bare ITO electrodes is seen. At higher potentials where polythiophene growth is observed on both types of surfaces, an additional amount of charge corresponding to the amount of thiophene groups along the SAM is transferred across the SAM-modified electrodes. Although spectroscopic data reveal no differences in the films grown on bare and 3TUTS-modified ITO, atomic force microscopy results show that the latter class of films are more homogeneous, have lower roughness, and are denser than the corresponding film grown on bare ITO. We attribute this difference in the morphology of the films to the high nucleation density arising from the pendent thiophene rings of the monolayer.

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Section: Introductionmentioning

confidence: 99%

Growth and Morphology of Polythiophene on Thiophene-Capped Monolayers: 1. Single Component Monolayers

et al. 2002

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“…In this context, electrochemical polymerization of Langmuir−Blodgett − and self-assembled − monolayers of water-insoluble amphiphilic pyrrole derivatives has already been well examined. In contrast the alternative use of aqueous micellar or nonmicellar solutions of pyrrole-containing surfactants has not been extensively explored. ,, Collard and Fox reported the formation of a lamellar conducting polymer by self-assembly of the water-soluble monomer 3-(3-alkylpyrrol-1-yl)propanesulfonate. , …”

Section: Introductionmentioning

confidence: 99%

Interfacial and Micellar Behavior of Pyrrole-Containing Cationic Surfactants

et al. 2001

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Micellar and interfacial behavior of electropolymerizable cationic surfactants containing a pyrrole group, and associated with various counteranions (bromide, nitrate, tetrafluoroborate and tosylate), have been investigated in pure water and in aqueous electrolytes. Results have been compared to that for the regular dodecyltrimethylammonium surfactant. The influence on the micellization process of counteranion binding, cationic headgroup size, and position of the pyrrole moiety (at the end of the lipid tail or close to the headgroup) has been studied in detail. 1H NMR experiments carried out in nonmicellar and in micellar solutions have shown that the pyrrole group remained confined in the micelle core.

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“…Of recent interest are SAMs that incorporate monomers or oligomers of conductive polymers. These systems are viewed as potential platforms for creating chemical and biological sensors − and optoelectronic devices − due to their ability to accept and eject charge and to compatibilize interfaces. SAMs can also be imprinted on surfaces so that conducting polymer films can be grown atop the patterned SAM. − While most of the work in this arena has been focused on single component SAMs that are capped with a monomeric species of a conducting polymer, we have been interested in mixed monolayers comprised of n -alkyltrichlorosilanes and ω-(3-thienyl)alkyltrichlorosilanes.…”

Section: Introductionmentioning

confidence: 99%

Surface Structure and Composition of Thiophene-Bearing Monolayers

et al. 2001

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We have used X-ray photoelectron spectroscopy and external reflectance Fourier transform infrared spectroscopy (ER-FTIR) to investigate the structure and composition of mixed monolayers made from n-alkyl chains and ω-(3-thienyl)alkyltrichlorosilanes. Monolayers made from 11-(3-thienyl)undecyltrichlorosilane (3TUTS) and undecyltrichlorosilane (UTS) and also from 16-(3-thienyl)hexadecyltrichlorosilane (3THTS) and hexadecyltrichlorosilane (HTS) were examined. ER-FTIR indicates that mixed monolayers made from 3TUTS/UTS and 3THTS/HTS form nearly liquidlike monolayers on indium tin oxide (ITO) substrates. The pendant thiophene group is located at the periphery of the self-assembled monolayer (SAM), and it appears to be oriented along the SAM. Both spectroscopic techniques suggest that during assembly of mixed monolayers, the ω-(3-thienyl)alkyltrichlorosilane species preferentially adsorbs, leading to a monolayer enriched in the thiophene-capped component. The information resulting from these studies will be generally useful for tailoring the structure and properties of electroactive monolayers on ITO substrates.

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Electrochemistry of Alkylpyrrole Monolayers Assembled by Self-Assembly and Langmuir−Blodgett Techniques

Cited by 11 publications

References 27 publications

Growth and Morphology of Polythiophene on Thiophene-Capped Monolayers: 1. Single Component Monolayers

Growth and Morphology of Polythiophene on Thiophene-Capped Monolayers: 1. Single Component Monolayers

Interfacial and Micellar Behavior of Pyrrole-Containing Cationic Surfactants

Surface Structure and Composition of Thiophene-Bearing Monolayers

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