Electrochemical responses on gold nanoparticles directly attached indium tin oxide electrodes fabricated using a 'touch' seed-mediated growth method

Ali Umar Akrajas, Munetaka Oyama

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4 Citations (Scopus)

Abstract

The electrochemical responses of hydroquinone and p-aminophenol in phosphate buffer solutions (pH 7.4) on gold nanoparticles directly attached indium tin oxide (AuNP/ITO) electrodes fabricated by a seed-mediated growth method are reported. Although the electron transfer reactions of these compounds are sluggish on the bare ITO electrode, improved electrochemical responses are observed on the AuNP/ITO electrodes, in particular, on those fabricated with the 'touch' seed-mediated growth method. In this method, by touching a seed solution containing 4 nm AuNP onto an ITO surface with a tissue paper, the attachment of Au seed is promoted. The AuNP/ITO electrode fabricated via the 'touch' seeding and 24 h growth shows better improved electrochemical responses, with peak separation values of 480 mV and 110 mV for hydroquinone and p-aminophenol, respectively. The degree of improvement has been compared with the previous results reported for the Au-sputtered ITO electrodes. Advantages of this new type of nanoelectrode ensembles are described.

Original languageEnglish
Pages (from-to)938-944
Number of pages7
JournalIndian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
Volume44
Issue number5
Publication statusPublished - May 2005
Externally publishedYes

Fingerprint

touch
ITO (semiconductors)
Gold
indium oxides
tin oxides
Seed
seeds
gold
Nanoparticles
nanoparticles
Electrodes
electrodes
Electrochemical electrodes
Buffers
Phosphates
Tissue
inoculation
attachment
indium tin oxide
Electrons

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

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abstract = "The electrochemical responses of hydroquinone and p-aminophenol in phosphate buffer solutions (pH 7.4) on gold nanoparticles directly attached indium tin oxide (AuNP/ITO) electrodes fabricated by a seed-mediated growth method are reported. Although the electron transfer reactions of these compounds are sluggish on the bare ITO electrode, improved electrochemical responses are observed on the AuNP/ITO electrodes, in particular, on those fabricated with the 'touch' seed-mediated growth method. In this method, by touching a seed solution containing 4 nm AuNP onto an ITO surface with a tissue paper, the attachment of Au seed is promoted. The AuNP/ITO electrode fabricated via the 'touch' seeding and 24 h growth shows better improved electrochemical responses, with peak separation values of 480 mV and 110 mV for hydroquinone and p-aminophenol, respectively. The degree of improvement has been compared with the previous results reported for the Au-sputtered ITO electrodes. Advantages of this new type of nanoelectrode ensembles are described.",
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AU - Akrajas, Ali Umar

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N2 - The electrochemical responses of hydroquinone and p-aminophenol in phosphate buffer solutions (pH 7.4) on gold nanoparticles directly attached indium tin oxide (AuNP/ITO) electrodes fabricated by a seed-mediated growth method are reported. Although the electron transfer reactions of these compounds are sluggish on the bare ITO electrode, improved electrochemical responses are observed on the AuNP/ITO electrodes, in particular, on those fabricated with the 'touch' seed-mediated growth method. In this method, by touching a seed solution containing 4 nm AuNP onto an ITO surface with a tissue paper, the attachment of Au seed is promoted. The AuNP/ITO electrode fabricated via the 'touch' seeding and 24 h growth shows better improved electrochemical responses, with peak separation values of 480 mV and 110 mV for hydroquinone and p-aminophenol, respectively. The degree of improvement has been compared with the previous results reported for the Au-sputtered ITO electrodes. Advantages of this new type of nanoelectrode ensembles are described.

AB - The electrochemical responses of hydroquinone and p-aminophenol in phosphate buffer solutions (pH 7.4) on gold nanoparticles directly attached indium tin oxide (AuNP/ITO) electrodes fabricated by a seed-mediated growth method are reported. Although the electron transfer reactions of these compounds are sluggish on the bare ITO electrode, improved electrochemical responses are observed on the AuNP/ITO electrodes, in particular, on those fabricated with the 'touch' seed-mediated growth method. In this method, by touching a seed solution containing 4 nm AuNP onto an ITO surface with a tissue paper, the attachment of Au seed is promoted. The AuNP/ITO electrode fabricated via the 'touch' seeding and 24 h growth shows better improved electrochemical responses, with peak separation values of 480 mV and 110 mV for hydroquinone and p-aminophenol, respectively. The degree of improvement has been compared with the previous results reported for the Au-sputtered ITO electrodes. Advantages of this new type of nanoelectrode ensembles are described.

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