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Electrografting and electropolymerization of nanoarrays of PANI filaments through silica mesochannels

Abstract : Vertically aligned mesoporous silica films electrogenerated on indium-tin oxide (ITO) electrodes are used as hard templates for the electrochemical growth of polyaniline (PANI) nanofilaments. To ensure proper adhesion of PANI to the underlying ITO surface, aniline moieties are first covalently attached to the bottom of mesochannels via electrografting of aminophenyl diazonium cations, serving in a second step as precursors for PANI growth by electropolymerization of aniline through the silica mesochannels. This was achieved by cyclic voltammetry or potentiostatically at an applied potential of +0.85 V (vs. Ag/AgCl), the latter offering a better control of the nanofilaments length by tuning the electropolymerization time. PANI wires remain attached to ITO after etching of the silica membrane, confirming the importance of initial electrografting. Although PANI nanofilaments in the silica membrane remain electroactive, enhanced peak currents were observed after silica removal as PANI nanofilaments offer a larger effective surface area to the electrolyte solution.
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Contributor : Grégoire Herzog Connect in order to contact the contributor
Submitted on : Wednesday, November 17, 2021 - 3:19:29 PM
Last modification on : Thursday, May 12, 2022 - 3:50:09 AM
Long-term archiving on: : Friday, February 18, 2022 - 8:21:24 PM


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Wahid Ullah, Grégoire Herzog, Neus Vilà, Alain Walcarius. Electrografting and electropolymerization of nanoarrays of PANI filaments through silica mesochannels. Electrochemistry Communications, Elsevier, 2021, 122, pp.106896. ⟨10.1016/j.elecom.2020.106896⟩. ⟨hal-03040482⟩



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