基于化学掺杂SnO2的氢泄漏传感器的研制

主要研究了掺杂过渡金属(Mn、Co)的SnO2纳米晶样品(半导体金属氧化物)的合成及其对氢气的敏感特性。该样品采用溶胶凝胶法制备,随后经过微波辐射进行合成处理。通过透射电子显微镜(TEM)和X射线衍射(XRD)表征方法证实,样品晶粒平均尺寸随掺杂过渡金属浓度的增加而减小;通过实验研究样品在不同温度和浓度下对H2的信号响应,评估采用这种纳米材料作为敏感材料的氢气传感器性能。同时研究了上述传感器对潜在干扰气体一氧化碳(CO)的选择性。结果表明,Co在提高SnO2纳米晶粒的传感性能方面比纯SnO2和掺杂了锰的SnO2更有效,这使得在250℃工作温度下,氢泄漏传感器具有优异的响应性、选择性和再现性。

Development of a Selective Hydrogen Leak Sensor Based on Chemically Doped SnO2

This paper mainly studies the synthesis of SnO2 Nano-crystalline samples(semiconductor metal oxides) doped with transition metal(Mn, Co) and their sensitivity to hydrogen. The samples were prepared by sol-gel method and then synthesized by microwave irradiation. By means of TEM and XRD, it is confirmed that the average grain size decreases with the increase of transition metal concentration. The signal response of the samples to hydrogen at different temperatures and concentrations was studied experimentally, and then evaluate the performance of the hydrogen sensor using this nanomaterial as the substrate. At the same time, the selectivity of these sensors to potential interfering gas carbon monoxide(CO) is studied. The results show that Co doped is more effective than pure SnO2 and Mn doped SnO2 in improving the sensing performance, allowing the fabrication of a hydrogen leak sensor with excellent response, good selectivity and reproducibility at the operating temperature of 250℃.