Title: Silver nanoparticles embedded three dimensional silicate sol-gel matrix modified electrode for nitrite sensor application

Authors: Govindhan Maduraiveeran; Palanisamy Manivasakan; Ramasamy Ramaraj

Addresses: Centre for Photoelectrochemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India. ' Centre for Photoelectrochemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India. ' Centre for Photoelectrochemistry, School of Chemistry, Madurai Kamaraj University, Madurai 625 021, India

Abstract: A simple amperometric sensor was fabricated by using silver nanoparticles (Agnps) embedded three dimensional silicate sol-gel (SG) matrix (SG-Agnps). The silver nanoparticles stabilised by SH functionalised 3-D silicate sol-gel network was coated on the glassy carbon electrode and used for the determination of nitrite ion in 0.1 M PBS (pH 7.2). The prepared silver nanoparticles-silicate sol-gel (SG-Agnps) modified electrode was characterised by UV-visible absorption spectroscopy, scanning electron microscopy (SEM) and electrochemical method. The electrochemical behaviour of SG-Agnps modified electrode was studied by using potassium ferricyanide as a redox marker to probe the tunable kinetic barrier of the dispersed silver nanoparticles in silicate sol-gel matrix. The SG-Agnps film was used as nanomaterials comprised electrochemical device for direct electrocatalysis and amperometric sensing of nitrite ion. The silver nanoparticles embedded silicate sol-gel film showed good stability and sensitivity with an experimental amperometric detection limit of 4 M. The fabrication of SG-Agnps modified electrode was very simple and it showed fast amperometric response and reproducible results for nitrite sensing.

Keywords: silver nanoparticles; silicate sol-gel; modified electrodes; amperometric sensing; nitrite detection; nitrite sensors; nanotechnology; nanomaterials; electrocatalysis.

DOI: 10.1504/IJNT.2011.044437

International Journal of Nanotechnology, 2011 Vol.8 No.10/11/12, pp.925 - 934

Available online: 24 Dec 2011 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article