A self-doped polyaniline derivative obtained by electrochemical copolymerization of aminoterephthalic acid and aniline

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Title: A self-doped polyaniline derivative obtained by electrochemical copolymerization of aminoterephthalic acid and aniline
Authors: Dkhili, Samiha | López-Bernabeu, Sara | Huerta Arráez, Francisco | Montilla, Francisco | Besbes-Hentati, Salma | Morallon, Emilia
Research Group/s: Electrocatálisis y Electroquímica de Polímeros
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Polyaniline | Self-doped conducting polymer | In situ FTIR | Electrochemical copolymerization | XPS
Knowledge Area: Química Física
Issue Date: Nov-2018
Publisher: Elsevier
Citation: Synthetic Metals. 2018, 245: 61-66. doi:10.1016/j.synthmet.2018.08.005
Abstract: The electrochemical copolymerization of aminoterephthalic acid and aniline can be achieved to yield a self-doped material showing electroactivity at physiological pH. The present study focusses on the management of the synthesis conditions to obtain a true copolymerization product and to control the relative amount of both comonomers eventually incorporated to the copolymer chain. Both, in situ FTIR spectroscopy and ex situ XPS techniques proved the successful incorporation of aminoterephthalic acid and, in parallel to other polyaniline parent derivatives, revealed the existence of redox transformations involving leucoemeraldine-emeraldine-pernigraniline transitions. The use of a high inversion potential (1.4 V/RHE) during electro-copolymerization resulted in a material enriched in aminoterephthalic acid fraction with respect to aniline, while this last component is favored at lower potentials. The pH behavior of copolymers in combination with in situ FTIR results strongly suggested that a larger content of aminoterephthalic acid (such as that obtained after deposition at 1.4 V) do not ensure an extensive self-doping process because a significant fraction of those carboxylic moieties remain inactive during the redox transformation. Instead, low inversion potentials are preferred to obtain a material with less defects and thoroughly electroactive at physiological pH.
Sponsor: Financial support from the Spanish Ministerio de Economía y Competitividad and FEDER funds (MAT2016-76595-R) is gratefully acknowledged. S. Dhkili thanks the Ministry of Higher Education and Scientific Research of Tunisia for funding her stay at the University of Alicante.
URI: http://hdl.handle.net/10045/79235
ISSN: 0379-6779 (Print) | 1879-3290 (Online)
DOI: 10.1016/j.synthmet.2018.08.005
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Published by Elsevier B.V.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.synthmet.2018.08.005
Appears in Collections:INV - GEPE - Artículos de Revistas

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