Si Renjun, Li Yan, Tian Jie, Tan Changshu, Chen Shaofeng, Lei Ming, Xie Feng, Guo Xin, Zhang Shunping
State Key Laboratory of Material Processing and Die & Mould Technology, Department of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
Shenzhen Power Supply Co., Ltd., Shenzhen 518002, China.
Nanomaterials (Basel). 2023 Feb 28;13(5):908. doi: 10.3390/nano13050908.
In this work, we studied the influence of cross-interference effects between VOCs and NO on the performance of SnO and Pt-SnO-based gas sensors. Sensing films were fabricated by screen printing. The results show that the response of the SnO sensors to NO under air is higher than that of Pt-SnO, but the response to VOCs is lower than that of Pt-SnO. The Pt-SnO sensor was significantly more responsive to VOCs in the NO background than in air. In the traditional single-component gas test, the pure SnO sensor showed good selectivity to VOCs and NO at 300 °C and 150 °C, respectively. Loading noble metal Pt improved the sensitivity to VOCs at high temperature, but also significantly increased the interference to NO sensitivity at low temperature. The explanation for this phenomenon is that the noble metal Pt can catalyze the reaction between NO and VOCs to generate more O, which further promotes the adsorption of VOCs. Therefore, selectivity cannot be simply determined by single-component gas testing alone. Mutual interference between mixed gases needs to be taken into account.
在本工作中，我们研究了挥发性有机化合物（VOCs）与一氧化氮（NO）之间的交叉干扰效应对基于SnO和Pt-SnO的气体传感器性能的影响。传感膜通过丝网印刷制备。结果表明，在空气中，SnO传感器对NO的响应高于Pt-SnO传感器，但对VOCs的响应低于Pt-SnO传感器。在NO背景下，Pt-SnO传感器对VOCs的响应明显高于在空气中的响应。在传统的单组分气体测试中，纯SnO传感器在300℃和150℃时分别对VOCs和NO表现出良好的选择性。负载贵金属Pt提高了高温下对VOCs的灵敏度，但也显著增加了低温下对NO灵敏度的干扰。这种现象的解释是，贵金属Pt可以催化NO与VOCs之间的反应生成更多的氧，这进一步促进了VOCs的吸附。因此，选择性不能仅通过单组分气体测试简单确定。需要考虑混合气体之间的相互干扰。
