The Nonenzyme Ethanol Sensor Based on Pt NPs and Fe3O4 MNPs Modified Au Electrode

The none enzyme ethanol sensor was prepared using Pt nanoparticles (NPs) and Fe3O4 magnetic nanoparticles (MNPs) modified Au electrode. Pt NPs were deposited on the gold plated electrode through the method of potentiostatic deposition. Fe3O4 magnetic nanoparticles were added to the surface of Pt NPs modified Au electrode to obtain the Au/Pt/Fe(3)O(4)MNPs electrode. The as-prepared Au/Pt/Fe(3)O(4)MNPs electrode was used for the detection of liquid ethanol without using enzyme. Cyclic voltammetry and differential pulse voltammetry were used to study the behavior of ethanol electro-catalytic oxidation on Pt/Au/Fe3O4 electrode. It was found that Pt NPs played strong catalytic oxidation role of ethanol with the presence of Fe3O4 MNPs. The linear range of Au/Pt/Fe(3)O(4)MNPs electrode for the detection of ethanol was of 2 x 10(-5) similar to 1.1 x 10(-4) mol.L-1 and the detection limit was of 3.2 x 10(-6) mol.L-1 when signal to noise ratio was 3 sigma. The sensibility of the sensor is 420.4 mu A.mmol(-1).cm-(2). The simple method provided an effective means for fabricating the novel sensors.