UV-activated hollow ZnO@TiO2 heterostructured nanaospheres for detecting formaldehyde at room temperature

Enhanced acetone gas sensing performance of ZnO polyhedrons decorated with LaFeO3 nanoparticles

“…The baseline resistance and response decreases continuously with increasing ambient humidity and is maximum at a humidity of 23% RH. This is due to the fact that water molecules are adsorbed more on the surface of the material, occupying the active sites on the surface of the material, leading to a decrease in the amount of adsorbed oxygen involved in the redox reaction, which results in an increasingly lower response of the sensor at high relative humidity [48,49]. Additionally, water molecules can hinder the adsorption of acetone, and at high relative humidity, surface adsorbed oxygen and water molecules react to form surface hydroxyl groups, leading to a decrease in the baseline resistance of the sensor, and thus a decrease in response [50].…”