Planar Electrodes, Modified With Gold And Carbon Nanomaterials, As Sensitive Elements Of Н2O2 Voltammetric Sensors

Abstract

Sensitive element of hydrogen peroxide amperometric sensor based on planar carbon electrodes (PCE), modifie with gold particles and composite film silica-carbon nanomaterials has been developed. The combination of gold particles and composite film SiO 2-multi-wall carbon nanotubes (MWCNTs) as a PCE modifiers allows to detect H 2 O 2 by its oxidation current in the concentration range of 10-5-10-3 M with the detection limit of 7.0•10-6 M, which is one order lower than for PCE. A tenfold excess of ascorbic acid and other strong reductants interfere H 2 O 2 determination. Using of PCE, modified with SiO 2-CFO film, where CFO-nanoparticles of carbon fluorooxide allows to detect hydrogen peroxide by its reduction current, that significantly improves a selectivity. The highest sensitivity and linear range of calibration graph for H 2 O 2 determination were obtained for PCE-SiO 2-CFO.