TY - JOUR
T1 - Rapid and Stable Detection of Carbon Monoxide in Changing Humidity Atmospheres Using Clustered In2O3/CuO Nanospheres
AU - Sun, Yongjiao
AU - Zhao, Zhenting
AU - Suematsu, Koichi
AU - Li, Pengwei
AU - Yu, Zhichao
AU - Zhang, Wendong
AU - Hu, Jie
AU - Shimanoe, Kengo
N1 - Funding Information:
This research was supported by the National Natural Science Foundation of China (61904122, 61901293, and 61901186), Natural Science of Shanxi Province (2016011039 and 201801D221188), and University Science and Technology Innovation Project of Shanxi Province (2019L0281 and 2019L0316).
Publisher Copyright:
Copyright © 2020 American Chemical Society.
PY - 2020/4/24
Y1 - 2020/4/24
N2 - 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 °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.
AB - 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 °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.
UR - http://www.scopus.com/inward/record.url?scp=85084028013&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85084028013&partnerID=8YFLogxK
U2 - 10.1021/acssensors.9b02557
DO - 10.1021/acssensors.9b02557
M3 - Article
C2 - 32208598
AN - SCOPUS:85084028013
SN - 2379-3694
VL - 5
SP - 1040
EP - 1049
JO - ACS Sensors
JF - ACS Sensors
IS - 4
ER -