Amperometric Sensing of H2O2 using Pt–TiO2/Reduced Graphene Oxide Nanocomposites

Authors

  • Dr. Salvatore Gianluca Leonardi,

    1. Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Contrada di Dio, 98166, Messina (Italy)
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  • Dr. Davide Aloisio,

    1. Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Contrada di Dio, 98166, Messina (Italy)
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  • Prof. Nicola Donato,

    1. Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Contrada di Dio, 98166, Messina (Italy)
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  • Dr. Patrícia A. Russo,

    1. Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal)
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  • Marta C. Ferro,

    1. Department of Materials and Ceramic Engineering, CICECO, University of Aveiro, 3810-193 Aveiro (Portugal)
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  • Prof. Nicola Pinna,

    1. Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin (Germany)
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  • Prof. Giovanni Neri

    Corresponding author
    1. Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Contrada di Dio, 98166, Messina (Italy)
    • Department of Electronic Engineering, Chemistry and Industrial Engineering, University of Messina, Contrada di Dio, 98166, Messina (Italy)

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Abstract

Nanostructures made of titanium dioxide and/or platinum nanoparticles supported on reduced graphene oxide (RGO) were synthesized by a simple and fast microwave-assisted route and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and Raman spectroscopies. The composites consist of RGO sheets fully and homogeneously coated with a dense layer of 8 nm TiO2 and/or 2 nm Pt nanoparticles. Screen-printed flexible sensors based on Pt–TiO2/RGO composites are applied for the amperometric detection of hydrogen peroxide (H2O2). The electrochemical characteristics of Pt/RGO, TiO2/RGO and Pt–TiO2/RGO-modified screen printed electrodes are investigated and discussed. The developed sensor allows the detection of H2O2, with a linear response from 0 to 20 mM of H2O2 and a sensitivity of 40 μA mM−1 cm−2. The resulting device is also suitable for the analysis of this toxic compound in milk.

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