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Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films
Gold (Au) electrodes coated with layer-by-layer (LbL) thin films composed of chitosan (CHI) were prepared to evaluate the redox properties of hexaammine ruthenium ions, Ru(NH(3))(6)(3+), and ferricyanide ions, Fe(CN)(6)(3−) LbL films were prepared on an Au electrode by electrostatic LbL deposition u...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2013
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5452795/ https://www.ncbi.nlm.nih.gov/pubmed/28788399 http://dx.doi.org/10.3390/ma6115427 |
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author | Takahashi, Shigehiro Watahiki, Ryota Tomida, Kohji Wang, Baozhen Anzai, Jun-ichi |
author_facet | Takahashi, Shigehiro Watahiki, Ryota Tomida, Kohji Wang, Baozhen Anzai, Jun-ichi |
author_sort | Takahashi, Shigehiro |
collection | PubMed |
description | Gold (Au) electrodes coated with layer-by-layer (LbL) thin films composed of chitosan (CHI) were prepared to evaluate the redox properties of hexaammine ruthenium ions, Ru(NH(3))(6)(3+), and ferricyanide ions, Fe(CN)(6)(3−) LbL films were prepared on an Au electrode by electrostatic LbL deposition using polycationic CHI and poly(vinyl sulfate) (PVS) or poly(acrylic acid) (PAA) as anionic component. Redox peak current in cyclic voltammetry of Ru(NH(3))(6)(3+) on the CHI/PVS and CHI/PAA film-coated electrodes increased with increasing thickness of the films. Interestingly, the cyclic voltammograms showed two pair of redox peaks, originating from Ru(NH(3))(6)(3+) diffusing across the LbL layers and from those confined in the film. The results were rationalized in terms of the electrostatic interactions between Ru(NH(3))(6)(3+) and excess negative charges in the LbL films originating from PVS and PAA. In contrast, Fe(CN)(6)(3−) was not confined in the LbL films due to electrostatic repulsion of Fe(CN)(6)(3−) and excess negative charges. Significant amounts of Ru(NH(3))(6)(3+) were confined in the films at pH 7.0, whereas few ions were bound at pH 3.0 due to the reduced net negative charge in the films. The results suggest a potential use of the CHI-containing LbL films as scaffold for immobilizing positively charged ionic species on the electrode surface. |
format | Online Article Text |
id | pubmed-5452795 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2013 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-54527952017-07-28 Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films Takahashi, Shigehiro Watahiki, Ryota Tomida, Kohji Wang, Baozhen Anzai, Jun-ichi Materials (Basel) Communication Gold (Au) electrodes coated with layer-by-layer (LbL) thin films composed of chitosan (CHI) were prepared to evaluate the redox properties of hexaammine ruthenium ions, Ru(NH(3))(6)(3+), and ferricyanide ions, Fe(CN)(6)(3−) LbL films were prepared on an Au electrode by electrostatic LbL deposition using polycationic CHI and poly(vinyl sulfate) (PVS) or poly(acrylic acid) (PAA) as anionic component. Redox peak current in cyclic voltammetry of Ru(NH(3))(6)(3+) on the CHI/PVS and CHI/PAA film-coated electrodes increased with increasing thickness of the films. Interestingly, the cyclic voltammograms showed two pair of redox peaks, originating from Ru(NH(3))(6)(3+) diffusing across the LbL layers and from those confined in the film. The results were rationalized in terms of the electrostatic interactions between Ru(NH(3))(6)(3+) and excess negative charges in the LbL films originating from PVS and PAA. In contrast, Fe(CN)(6)(3−) was not confined in the LbL films due to electrostatic repulsion of Fe(CN)(6)(3−) and excess negative charges. Significant amounts of Ru(NH(3))(6)(3+) were confined in the films at pH 7.0, whereas few ions were bound at pH 3.0 due to the reduced net negative charge in the films. The results suggest a potential use of the CHI-containing LbL films as scaffold for immobilizing positively charged ionic species on the electrode surface. MDPI 2013-11-21 /pmc/articles/PMC5452795/ /pubmed/28788399 http://dx.doi.org/10.3390/ma6115427 Text en © 2013 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/3.0/). |
spellingShingle | Communication Takahashi, Shigehiro Watahiki, Ryota Tomida, Kohji Wang, Baozhen Anzai, Jun-ichi Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films |
title | Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films |
title_full | Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films |
title_fullStr | Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films |
title_full_unstemmed | Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films |
title_short | Voltammetric Studies on Gold Electrodes Coated with Chitosan-Containing Layer-by-Layer Films |
title_sort | voltammetric studies on gold electrodes coated with chitosan-containing layer-by-layer films |
topic | Communication |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5452795/ https://www.ncbi.nlm.nih.gov/pubmed/28788399 http://dx.doi.org/10.3390/ma6115427 |
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