Planar Electrodes, Modified with Gold and Carbon Nanomaterials, as Sensitive Elements of Н2O2 Voltammetric Sensors A.V. Huseinov†, D.M. Korytko†, S.A. Alekseev*†, O.Y. Tananaiko**†
	*,** Corresponding authors † Taras Shevchenko National University of Kyiv, Volodymyrska str., 64, Kyiv, Ukraine, 01601 E-mail: alekseev@univ.kiev.ua*; nadzhafova@univ.kiev.ua**
	Methods Objects Chem. Anal., 2016, 11(2), p. 88-99 https://doi.org/10.17721/moca.2016.82-93
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Abstract

Sensitive element of hydrogen peroxide amperometric sensor based on planar carbon electrodes (PCE), modified with gold particles and composite film silica-carbon nanomaterials has been developed. The combination of gold particles and composite film SiO₂-multi-wall carbon nanotubes (MWCNTs) as a PCE modifiers allows to detect H₂O₂ 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 H₂O₂ determination. Using of PCE, modified with SiO₂-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 H₂O₂ determination were obtained for PCE-SiO₂-CFO.

Keywords: planar electrodes, silicon oxide, sol-gel, voltammetry, carbon nanoparticles, gold particles

Article language: Rus