Aminosilicate sol-gel embedded core-shell (TiO₂-Au)nps nanomaterials modified electrode for the electrochemical detection of nitric oxide

Abstract

A glassy carbon electrode modified with amine functionalized silicate sol-gel supported core-shell titanium dioxide-gold nanocomposite materials (EDAS/(TiO_2-Au)_nps) has been prepared and used as an electrochemical sensor for nitric oxide detection. The aminosilicate supported core-shell nanomaterials have been synthesized by the chemical reduction of HAuCl₄ and deposition of the formed Au_nps on TiO_2- nanoparticles in the presence of N-[3-(trimethoxysilyl)propyl]-ethylene diamine as a support matrix and as a reducing agent. The so-prepared EDAS/(TiO_2--Au)_nps nanomaterials and the corresponding films have been characterized by spectral and electrochemical methods. A set of experimental conditions has been optimized for the fabrication of sensor electrode. The electrochemical properties of the GC/EDAS(TiO_2-Au)_nps modified electrode and the electrochemical detection of NO have been studied. The Osteryoung square wave voltammetric measurements reveals that the current response observed at the GC/EDAS(TiO_2-Au)_nps modified electrode for different concentrations of NO is linear with the lowest detection limit of 1 μ M.