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Sensors 2013, 13(3), 3878-3888; doi:10.3390/s130303878

Electrical Characterization and Hydrogen Peroxide Sensing Properties of Gold/Nafion:Polypyrrole/MWCNTs Electrochemical Devices

Dipartimento di Ingegneria Elettronica, Chimica e Ingegneria Industriale, Università di Messina, Messina I-98166, Italy
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Received: 2 February 2013 / Revised: 5 March 2013 / Accepted: 12 March 2013 / Published: 19 March 2013
(This article belongs to the Section Chemical Sensors)
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Abstract

Electrochemical devices using as substrates copier grade transparency sheets are developed by using ion conducting Nafion:polypyrrole mixtures, deposited between gold bottom electrodes and upper electrodes based on Multi Walled Carbon Nanotubes (MWCNTs). The electrical properties of the Nafion:polypyrrole blends and of the gold/Nafion:polypyrrole/MWCNTs devices are investigated under dry conditions and in deionized water by means of frequency dependent impedance measurements and time domain electrical characterization. According to current-voltage measurements carried out in deionized water, the steady state current forms cycles characterized by redox peaks, the intensity and position of which reversibly change in response to H2O2, with a lower detection limit in the micromolar range. The sensitivity that is obtained is comparable with that of other electrochemical sensors that however, unlike our devices, require supporting electrolytes.
Keywords: H2O2 sensor; MWCNTs dispersions; Nafion:polypyrrole H2O2 sensor; MWCNTs dispersions; Nafion:polypyrrole
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Scandurra, G.; Arena, A.; Ciofi, C.; Saitta, G. Electrical Characterization and Hydrogen Peroxide Sensing Properties of Gold/Nafion:Polypyrrole/MWCNTs Electrochemical Devices. Sensors 2013, 13, 3878-3888.

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