Silver nanoparticles embedded three dimensional silicate sol-gel matrix modified electrode for nitrite sensor application
by Govindhan Maduraiveeran; Palanisamy Manivasakan; Ramasamy Ramaraj
International Journal of Nanotechnology (IJNT), Vol. 8, No. 10/11/12, 2011

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.

Online publication date: Sat, 24-Dec-2011

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