Abstract
In this paper, a high-performance NO2 gas sensor based on CuWO4 nanoparticles decorated with reduced graphene oxide (rGO) nanosheets was successfully prepared by hydrothermal method without adding any surfactant. The products were synthetically characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. The performance of the NO2 gas sensor was investigated at room temperature. The results show that the CuWO4/rGO composite sensor has higher response to NO2 gas, shorter response/recovery time, and better repeatability than the other two single-component sensors. The enhanced NO2-sensing properties of the CuWO4/rGO composite sensor were ascribed to the synergistic effect of CuWO4 and rGO. The CuWO4/rGO composite sensor is highly suitable for NO2 gas sensing in applications of environmental monitoring.
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