Light-activation of gas sensitive layers based on zinc oxide nanowires

Abstract

In this work, a sensor layer based on zinc oxide nanowires was synthesized by low-temperature hydrothermal method. The gas sensitivity of sample to isopropyl alcohol vapor was studied both during heating and under ultraviolet radiation. It was shown that depending on the presence of moisture on the surface of zinc oxide nanowires, isopropyl alcohol vapor can act as a reducing or oxidizing gas upon activation of gas sensitivity by ultraviolet irradiation. It was shown that there is an optimal intensity of irradiation, which determines the maximum response of sample. The gas sensitivity under moist air conditions demonstrates the possibility of practical application of adsorption resistive gas sensors with light-activation at room temperature.

Синтез И Диагностика Газочувствительных Наноструктур На Основе Соединений Молибдена

“…Исследование сенсорных свойств синтезированных наноструктур проводились на специальном стенде [17,18] При исследовании селективности датчики подвергались воздействию тестируемых газов: изопропилового спирта с концентрацией 1000 мд и ацетона с концентрацией 1500 мд. Образцы показывают больший отклик к парам изопропилового спирта при концентрации ниже концентрации ацетона на 500 мд (см.…”

Sensitization of ZnO nanorods by AgInS-=SUB=-2-=/SUB=- colloidal quantum dots for adsorption gas sensors with light activation

“…The current through the sample was measured using the Keithley 6485 picoammeter at the voltage of 5 V. The concentration of the isopropyl alcohol vapors of 1000 ppm was controlled by velocities of the fluxes of the carrier gas (dried air) and the isopropyl alcohol, which is described in detail in the study [51].…”

Gas sensitivity of nanostructured coatings based on zinc oxide nanorods under combined activation

“…Although the replacement of heating by irradiation ensures the response of the sensor layers to the analyzed gases, irradiation, unlike heating, does not provide desorption of water molecules, and most studies are carried out using synthetic or pre-dried air. Adsorption of water molecules by the sensor layer leads to a decrease and then complete absence of the response to the analyzed gases [36,37]. Therefore, currently, the use of adsorption semiconductor sensors without heating for practical use in an air atmosphere is difficult.…”