Rapid and Stably Detection of Carbon Monoxide in Humidity Changed Atmospheres using Clustered In 2 O 3 /CuO Nanospheres.
ACS sensors(2020)
摘要
Clustered indium oxide/copper oxide (InO/CuO) nanospheres with different CuO amounts were successfully synthesized as sensing materials for the carbon monoxide (CO) detection. Component and morphological characterizations were performed by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Sensing performance for CO of the clustered InO and InO/CuO nanospheres were investigated under different temperatures and humidity conditions. The results show that the sensor based on 2 mol% InO/CuO (InCu2) exhibits about 3-fold improvement in the response to CO compared to that of InO with quick response and recovery time, wide linearity and low detection limit at 200℃ under 25% relative humidity (RH). Moreover, it shows tiny resistance and response declines despite the wide range of humidity variation from 25 to 95% RH. Meanwhile, the mechanism of enhanced gas-sensing performances and anti-humidity properties of InCu2 were systematic investigated. We speculated that most of the water-driven species are predominantly adsorbed by the CuO due to its high affinity to hydroxyl group, which suppress the interaction between the moisture and the InO. InCu2 is a new and promising CO sensing material in a highly sensitive and fast manner with negligible interference from ambient humidity.
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关键词
In2O3/CuO,clustered nanospheres,rapid detection,antihumidity,CO
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