Journal
ACS SENSORS
Volume 5, Issue 4, Pages 1040-1049Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.9b02557
Keywords
In2O3/CuO; clustered nanospheres; rapid detection; antihumidity; CO
Funding
- National Natural Science Foundation of China [61904122, 61901293, 61901186]
- Natural Science of Shanxi Province [2016011039, 201801D221188]
- University Science and Technology Innovation Project of Shanxi Province [2019L0281, 2019L0316]
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Clustered indium oxide/copper oxide (In2O3/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 In2O3 and In2O3/CuO nanospheres were investigated under different temperatures and humidity conditions. The results show that the sensors based on 2 mol % In2O3/CuO (InCu2) exhibit about threefold improvement in response to CO compared to that of In2O3 with quick response and recovery time, wide linearity, and low detection limit at 200 degrees C 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 antihumidity properties of InCu2 were systematically investigated. We speculated that most of the water-driven species are predominantly adsorbed by CuO due to its high affinity to the hydroxyl group, which suppresses the interaction between moisture and In2O3. InCu2 is a new and promising material to sense CO in a highly sensitive and fast manner with negligible interference from ambient humidity.
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