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Morphology Control in Electrochemically Grown Conducting Polymer Films. 3. A Comparative Study of Polyaniline Films on Bare Gold and on Gold Pretreated with p-Aminothiophenol

Sabatani, Eyal and Gafni, Yael and Rubinstein, Israel (1995) Morphology Control in Electrochemically Grown Conducting Polymer Films. 3. A Comparative Study of Polyaniline Films on Bare Gold and on Gold Pretreated with p-Aminothiophenol. Journal of Physical Chemistry, 99 (32). pp. 12305-12311. ISSN 0022-3654. https://resolver.caltech.edu/CaltechAUTHORS:20180525-131710213

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Abstract

Polyaniline (PANI) films deposited galvanostatically on gold electrodes precoated with self-assembled monolayers of p-aminothiophenol (PATP) exhibit significantly higher optical densities than similar polymer films deposited on bare gold, as measured by in situ ellipsometry. At the same time there is no change in the total mass of the deposit or in the amount of polymer, as indicated by in situ quartz crystal microbalance measurements and by ex situ Rutherford backscattering results, respectively. It is therefore concluded that PANI grown on Au/PATP is considerably denser than PANI grown on bare Au. Failure of other self-assembled monolayers to produce a similar effect suggests that the chemical resemblance of P A P to the aniline monomer is a key factor in its ability to alter the morphology of electrodeposited PANI. The ac-impedance measurements indicate that the morphological change (i.e., densification) is accompanied by pronounced improvement in the electrochemical response of PANI. In particular, the insulator/conductor switching rate is enhanced for PANI grown on Au/PAP relative to PANI grown under similar conditions on bare Au. Moreover, a substantial increase in the rate of discharge is observed for fresh PANI on AuRATP when applying a cathodic bias to the electrode. It is suggested that morphological restructuring is the limiting step during initial discharge of PANI grown on bare Au.


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https://dx.doi.org/10.1021/j100032a039DOIArticle
Additional Information:© 1995 American Chemical Society. Received: March 28, 1995; In Final Form: June 1, 1995. The authors acknowledge support of this work by The Basic Research Foundation, Israel Academy of Sciences and Humanities, Grant No. 400/90. Special thanks to J. G. Beery (Los Alamos National Laboratory) for performing the RBS experiments and to S. Gottesfeld (Los Alamos National Laboratory) for valuable advice throughout this work.
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Funding AgencyGrant Number
Israel Academy of Sciences and Humanities400/90
Issue or Number:32
Record Number:CaltechAUTHORS:20180525-131710213
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180525-131710213
Official Citation:Morphology Control in Electrochemically Grown Conducting Polymer Films. 3. A Comparative Study of Polyaniline Films on Bare Gold and on Gold Pretreated with p-Aminothiophenol Eyal Sabatani, Yael Gafni, and Israel Rubinstein The Journal of Physical Chemistry 1995 99 (32), 12305-12311 DOI: 10.1021/j100032a039
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:86631
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:25 May 2018 20:36
Last Modified:03 Oct 2019 19:46

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