High response H2S chemiresistive gas sensor based on multidimensional CuO/CeO2: The application for real-time portable alarm device
Real-time monitoring of toxic and harmful hydrogen sulfide (H 2 S) is crucial in the extraction process of fossil fuels. However, in the process of detecting H 2 S, there will be difficulties in desorption, low response, poor anti-interference ability, and poor long-term stability. The multidimensional copper oxide (CuO) composite cerium oxide (CeO 2 ) was synthesized by hydrothermal method and calcination techniques, and a gas sensor with easy desorption, high response, strong anti-interference ability, and excellent long-term stability for monitoring H 2 S was effectively prepared. Through various characterization tests such as X-ray diffraction (XRD) and scanning electron microscope (SEM), it was found that the composite material has multidimensional characteristics. When detecting 100 parts per million (ppm) of H 2 S at the optimal operating temperature of 180℃, the CuO/CeO 2 gas sensor with the optimal ratio (n Cu : n Ce =1:1) showed an extremely high response (2010). At the same time, the gas sensor has extremely strong anti-interference ability and excellent long-term stability. In addition, these excellent H 2 S sensing properties are attributed to the excellent oxygen storage characteristics of CeO 2 and the synergistic effect of CuO and CeO 2 . This provides more active sites for the absorption of H 2 S. Finally, to achieve real-time monitoring and alarm of H 2 S, a portable real-time monitoring and alarm device was made. When detecting different concentrations of H 2 S, it will flash corresponding color lights and give an alarm to achieve the monitoring function and ensure the safety and health of workers. The multi-dimensional CuO/CeO 2 prepared has excellent gas sensing performance, providing a new method for H 2 S detection.
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