Si-Cu nanocomposite as an effective sensing layer for H2S based on quartz surface acoustic wave sensors
Si-Cu nanocomposite as an effective sensing layer for H2S based on quartz surface acoustic wave sensors
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Si-Cu纳米复合材料作为基于石英表面声波传感器的H2S有效传感层
DOI：
10.1016/j.sna.2023.114225
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Che J
中科院分区：
文献类型：
--
作者：
Che J
由于H2S气体传感器在工业中的广泛应用，且泄漏频繁，危及人们的生命安全，因此开发高灵敏度的H2S气体传感器一直是一个严峻的挑战。在这项工作中，开发了一种基于Si-Cu纳米复合材料的高灵敏度室温SAW H2S气体传感器。该复合层中的 Cu 含量对传感器的 H2S 响应起着关键作用，因为 CuO 是 H2S 的良好吸附位点，存在于 Cu 的表面。非晶硅含量导致高度多孔结构，增强了 CuO 和 H2S 之间的相互作用。这种相互作用导致 CuS 的形成和传感器的负频率响应。 H2O分子有效参与CuO和H2S之间的反应，并且H2S的反应在潮湿环境中显着增强。在相对湿度为 60% 的情况下，传感器可以检测 50 ppb H2S，响应为 −225 Hz。
It has been a critical challenge to develop highly sensitive H2S gas sensors, due to its wide-range application in industry and frequent leakage, which endangers people's lives. In this work, a highly sensitive room-temperature SAW H2S gas sensor based on Si-Cu nanocomposite was developed. The Cu content in this composite layer plays a key role for H2S response of the sensor because CuO, an excellent adsorption site for H2S, presents on the surface of Cu. The amorphous Si content results in the highly porous structure enhancing the interaction between CuO and H2S. The interaction leads to the formation of CuS and a negative frequency response of the sensor. H2O molecules effectively participate the reactions between CuO and H2S, and the responses of H2S were significantly enhanced in a moister environment. With the relative humidity of 60 %, the sensor can detect 50 ppb H2S with a response of − 225 Hz.