Ag@iron oxide nanocomposite powders were synthesized via a two-step chemical method. Characterization by UV-Vis, XRD, SEM-EDX and TEM revealed they are composed of nanosized crystalline silver particles in strict contact with amorphous iron oxide(s). The electrochemical behavior of the synthesized Ag@iron oxide composite was investigated by cyclic voltammetry. Compared with the single phase-modified electrodes, the Ag@iron oxide/SPCE electrode exhibits an enhanced cathodic current in response to the target analyte, due to a synergistic effect between Ag crystallites and amorphous iron oxide nanoparticles. An amperometric sensor for detection of nitrate based on Ag@iron oxide modified screen-printed electrode (Ag@iron oxide/SPCE) has been fabricated, showing a good sensitivity (663 µA mM−1 cm−2) and a detection limit of 30 µM.
Electrochemical Properties of Ag@iron Oxide Nanocomposite for Application as Nitrate Sensor
Bonyani, M;Mirzaei, A;Leonardi, SG;Bonavita, A;Neri, G
2015-01-01
Abstract
Ag@iron oxide nanocomposite powders were synthesized via a two-step chemical method. Characterization by UV-Vis, XRD, SEM-EDX and TEM revealed they are composed of nanosized crystalline silver particles in strict contact with amorphous iron oxide(s). The electrochemical behavior of the synthesized Ag@iron oxide composite was investigated by cyclic voltammetry. Compared with the single phase-modified electrodes, the Ag@iron oxide/SPCE electrode exhibits an enhanced cathodic current in response to the target analyte, due to a synergistic effect between Ag crystallites and amorphous iron oxide nanoparticles. An amperometric sensor for detection of nitrate based on Ag@iron oxide modified screen-printed electrode (Ag@iron oxide/SPCE) has been fabricated, showing a good sensitivity (663 µA mM−1 cm−2) and a detection limit of 30 µM.Pubblicazioni consigliate
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