Abstract
A facile microwave irradiation was used to synthesize Ag nanoparticle supported on vanadium oxide nanotubes (VONTs) in this paper. The VONTs on alumina tube installed with Pt electrodes were tested for gas sensing towards C 2 H 5 OH , NH 3 and C 6 H 5 CH 3 gases. Detailed studies showed that the sensing capabilities were greatly enhanced in comparison to those of pure nanotubes. It was found that the Ag nanoparticles supported on VONTs sensing films exhibited a high C 2 H 5 OH selectivity compared with NH 3 and C 6 H 5 CH 3 gases. When the sensor is exposed to C 2 H 5 OH , the ethanol molecules interact with the preadsorbed oxygen ions on the Ag nanoparticles surface. The ethanol oxidation on the Ag nanoparticles leads to the transfer of electrons into the semiconducting VONTs and this is reflected as the change in conductance of sensor. The presence of Ag nanoparticles on the surface of VONTs serves to enhance the C 2 H 5 OH oxidation due to a higher oxygen ion-chemisorption on the conductive Ag nanoparticle surfaces.
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