Gold nanoparticles embedded in silica sol-gel matrix as an amperometric sensor for hydrogen peroxide

Maduraiveeran, Govindhan ; Ramaraj, Ramasamy (2007) Gold nanoparticles embedded in silica sol-gel matrix as an amperometric sensor for hydrogen peroxide Journal of Electroanalytical Chemistry, 608 (1). pp. 52-58. ISSN 0022-0728

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/j.jelechem.2007.05.009

Abstract

Gold nanoparticles (Aunp) embedded in methyltrimethoxysilane sol-gel (SG) film coated electrode was prepared (GC/SG-Aunp) and characterized. The electrochemical response observed for the GC/SG-Aunp electrode reveals that the dispersed gold nanoparticles in the silicate film are in electrical contact with each other. The potassium ferricyanide redox couple was used as a marker to probe the tunable kinetic barrier of the gold nanoparticles dispersion in the silicate matrix. The GC/SG-Aunp electrode showed good electrocatalytic response for hydrogen peroxide (H2O2) reduction without an enzyme or mediator immobilized in the silicate sol-gel film. Linear relationship was observed for H2O2 reduction in the concentration range from 2.5 to 45 μ M at the GC/SG-Aunp electrode at an applied potential of -0.5 V and the detection limit was calculated as 3.15 nM. The GC/SG-Aunp modified electrode is simple to prepare and this electrode shows fast response, good stability and reproducible results and could be applied as an amperometric sensor for H2O2.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Gold Nanoparticles; Methyltrimethoxysilane Sol-gel; Modified Electrodes; Hydrogen Peroxide; Sensor
ID Code:88793
Deposited On:29 Mar 2012 15:13
Last Modified:29 Mar 2012 15:13

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