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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
* Author to whom correspondence should be addressed.
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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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) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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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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