title: Electrical characterization and hydrogen peroxide sensing properties of gold/Nafion:polypyrrole/MWCNTs electrochemical devices.
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.
authors.affiliation: Dipartimento di Ingegneria Elettronica, Chimica e Ingegneria Industriale, Università di Messina, Messina, Italy. gscandurra@unime.it
authors.forename: Graziella
authors.initials: G
authors.lastname: Scandurra
authors.forename: Antonella
authors.initials: A
authors.lastname: Arena
authors.forename: Carmine
authors.initials: C
authors.lastname: Ciofi
authors.forename: Gaetano
authors.initials: G
authors.lastname: Saitta
mesh_terms: D004560:Electricity; D055664:Electrochemical Techniques / Q000295:instrumentation*; D005465:Fluorocarbon Polymers / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000302:isolation & purification*; D037742:Nanotubes, Carbon / Q000737:chemistry; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*
chemical_list: D005465:Fluorocarbon Polymers; D037742:Nanotubes, Carbon; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; C040402:perfluorosulfonic acid; D006046:Gold; D006861:Hydrogen Peroxide