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A new low bandgap hybrid polymer film obtained by electropolymerization of 3,4-ethylenedioxythiophene with bis(1,3-dithiole-2-thione-4,5-dithiolate)platinate(II) dianion, PEDOT/[Pt(dmit)2]2−

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Abstract

In this work, we report the electrochemical polymerization of novel low bandgap hybrid polymer films based on 3,4-ethylenedioxythiophene containing bis(1,3-dithiole-2-thione-4,5-dithiolate)platinate(II) dianions, PEDOT/[Pt(dmit)2]2− which were obtained under galvanostatic conditions using a synthesis charge (Qs) of 12.5 mC cm−2. Morphological studies of these films by SEM and AFM revealed a regular surface with volumetric roughness (RMS) of 141.8 nm as well as high homogeneity in its composition. FTIR studies depicted bands assigned to both polymer and counterions, confirming a strong interaction among the components. Cyclic voltammetry in a monomer free solution showed well-defined peaks and potentials similar to that of the free counterion, evincing that the electron transfer processes in the film are mainly ruled by the dmit-based counterion. Optoelectronics studies of hybrid films showed a strong absorption at 786 nm and a multicolor electrochromism (greenish yellow-deep green). The direct optical bandgap (E g), calculated from the absorption spectrum, was 1.42 eV, suggesting that the dmit-based dianion plays an important role on the optoelectronic properties of the hybrid polymer films.

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Acknowledgments

The author would like to dedicate this work to my friend Cassiano Pedro da Silva who passed away on December 12, 2016.

Funding

The authors would like to thank CAPES, CNPq, FAPEMIG, and FAPERJ (Project No. E-26/111.355/2014), Brazilian agencies for funding this work.

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Authors and Affiliations

  1. Departamento de Química, Universidade Federal Rural do Rio de Janeiro (UFRRJ), Seropédica, Rio de Janeiro, Brazil

    Antonio Gerson Bernardo da Cruz

  2. Instituto de Física e Química, Universidade Federal de Itajubá (UNIFEI), Itajubá, Minas Gerais, Brazil

    Maria Elena Leyva

  3. PEMM/COPPE, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Rio de Janeiro, Brazil

    Renata Antoun Simão

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  1. Antonio Gerson Bernardo da Cruz
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  2. Maria Elena Leyva
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Correspondence to Antonio Gerson Bernardo da Cruz.

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Bernardo da Cruz, A., Leyva, M. & Simão, R.A. A new low bandgap hybrid polymer film obtained by electropolymerization of 3,4-ethylenedioxythiophene with bis(1,3-dithiole-2-thione-4,5-dithiolate)platinate(II) dianion, PEDOT/[Pt(dmit)2]2− . J Solid State Electrochem 22, 1459–1469 (2018). https://doi.org/10.1007/s10008-017-3798-6

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