Abstract
The possibility of using a nanocomposite based on zinc oxide ultrafine powder and polyvinyl alcohol as a sensitive element of a gas sensor is analyzed. It is shown that zinc oxide nanoparticles with a shape close to a rectangular parallelepiped can be considered as potential wells, separated by layers of polyvinyl alcohol that form potential barriers. The contribution of the tunneling component to nanocomposite current density is estimated for systems with and without oxygen chemisorptions. Results of numerical simulation are shown that a shift of the peaks in the dependence of transmittance on electron energy and a decrease of the tunneling current density are going with an increase in the concentration of oxygen atoms. Perspectives of the use of quantum-dimensional effects in the development of new generation gas sensors, which are based on conductivity modulation during sensor interaction with analyte gases, are demonstrated
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