Shi Jiawen, Liu Sen, Zhang Peng, Sui Ning, Cao Shuang, Zhou Tingting, Zhang Tong
State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, Changchun 130012, People's Republic of China.
Nanotechnology. 2021 Sep 1;32(47). doi: 10.1088/1361-6528/abfe92.
Methane (CH) gas sensors play an important role in industrial safety and detection of indoor gas quality. In general, metal oxide semiconductor sensing materials with nano-structure have high responses to the target gas. However, the sensor resistance is usually very high. Considering the practical application, it is vital to reduce base resistance and improve sensitivity for gas sensors. Herein, Pd-doped SnOnanoparticles were prepared as the basis material by a simple sol-gel method. In order to adjust the resistance, the pentavalent metal element (Sb) was introduced via a simple doping route. As CHsensing layers, the prepared SnO-sensors doped with Pd and Sb exhibited the most obvious resistance reduction effect. Meantime, excellent sensing performances including high response, fast response/recovery time, excellent reproducibility and great stability were also obtained. In-depth research has shown that the ability to reduce resistance depends on the effective internal doping of cation with high valence. The enhanced sensing capability can be attributed to the 'synergistic effects' including catalytic effects of novel metals, increased oxygen vacancies and decreased band gap energy. This work can provide a new opportunity to design metal oxide sensing materials with low resistance and high sensitivity.
甲烷（CH）气体传感器在工业安全和室内气体质量检测中发挥着重要作用。一般来说，具有纳米结构的金属氧化物半导体传感材料对目标气体具有高响应。然而，传感器电阻通常非常高。考虑到实际应用，降低气体传感器的基电阻并提高灵敏度至关重要。在此，通过简单的溶胶 - 凝胶法制备了钯掺杂的二氧化锡纳米颗粒作为基础材料。为了调节电阻，通过简单的掺杂途径引入了五价金属元素（锑）。作为CH传感层，所制备的掺杂钯和锑的二氧化锡传感器表现出最明显的电阻降低效果。同时，还获得了包括高响应、快速响应/恢复时间、优异的重现性和良好的稳定性在内的优异传感性能。深入研究表明，电阻降低能力取决于高价阳离子的有效内部掺杂。增强的传感能力可归因于“协同效应”，包括新型金属的催化作用、增加的氧空位和减小的带隙能量。这项工作可为设计低电阻和高灵敏度的金属氧化物传感材料提供新的契机。
