Abstract
The possibility of selective detection of NO2 in the air starting with a concentration of 1 ppm by means of sensors based on thin films of Au/WO3:Au when replacing the heating by the irradiation of the diode with the wavelength of 400 nm of maximum intensity of radiation is shown. Activation of photodesorption by irradiation reduces the response times of sensors under the influence of NO2 by an order of magnitude. It was found that the effect of high humidity in the conditions of irradiation of sensors at room temperature leads to an increase in response to NO2, due to the appearance of additional adsorption centers. The lack of sensor response to reducing gases and the change in the oxygen concentration in the gas mixture is caused by photodesorption of chemisorbed O2- when interacting with holes that generated under exposure of irradiation in the near-surface area of WO3.
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