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Issue 15, 2017
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Distribution of dopant ions around poly(3,4-ethylenedioxythiophene) chains: a theoretical study

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Abstract

The effect of counterions and multiple polymer chains on the properties and structure of poly(3,4-ethylenedioxythiophene) (PEDOT) doped with ClO4 has been examined using density functional theory (DFT) calculations with periodic boundary conditions (PBCs). Calculations on a one-dimensional periodic model with four explicit polymer repeat units and two ClO4 molecules indicate that the latter are separated as much as possible, with the salt structure and band gap obtained from such ClO4 distribution being in excellent agreement with those determined experimentally. On the other hand, DFT calculations on periodic models that include two chains indicate that neighboring PEDOT chains are shifted along the molecular axis by a half of the repeat unit length, with dopant ions intercalated between the polymer molecules acting as cement. In order to support these structural features, classical molecular dynamics (MD) simulations have been performed on a multiphasic system consisting of 69 explicit PEDOT chains anchored onto a steel surface, explicit ClO4 anions embedded in the polymer matrix, and an acetonitrile phase layer onto the polymer matrix. Analyses of the radial distribution functions indicate that the all-anti conformation, the relative disposition of adjacent PEDOT chains and the distribution of ClO4 dopant ions are fully consistent with periodic DFT predictions. The agreement between two such different methodologies allows reinforcing the microscopic understanding of the PEDOT film structure.

Graphical abstract: Distribution of dopant ions around poly(3,4-ethylenedioxythiophene) chains: a theoretical study

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Publication details

The article was received on 08 Feb 2017, accepted on 16 Mar 2017 and first published on 20 Mar 2017


Article type: Paper
DOI: 10.1039/C7CP00857K
Citation: Phys. Chem. Chem. Phys., 2017,19, 9889-9899
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    Distribution of dopant ions around poly(3,4-ethylenedioxythiophene) chains: a theoretical study

    J. Casanovas, D. Zanuy and C. Alemán, Phys. Chem. Chem. Phys., 2017, 19, 9889
    DOI: 10.1039/C7CP00857K

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