Sensory Properties of Nanostructured Wide-Band-Gap Semiconductor Oxides: Effect of Temperature and Size of Nanoparticles

摘要

The theory of the sensory effect developed by the authors is compared with the experimental data. For this purpose, the dependences of the sensitivity of a nanostructured sensor SnO2 with an average diameter of nanoparticles dav = 120 nm on the temperature are studied in a wide range of hydrogen concentrations. Theoretical curves are also built which are based on a theory taking into account both an increase in the response with the temperature growing at the expense of growth in the sensor reaction rate and its drop caused by desorption resulting in a reduction of the gas equilibrium concentration at the sensor surface. A comparison of the developed theory with the literature experimental data concerning the dependence of the sensor response to hydrogen on the temperature and size of nanoparticles SnO2 is also carried out. It is shown that the theory developed earlier qualitatively describes the experimental data.