基于声表面波的氢气传感器*

将钯基材料对氢气分子的特异选择性吸附能力与声表面波的快速响应特点相结合,可实现一种快速、高灵敏和低功耗的氢气检测与报警技术。传感器由双通道差分式振荡器与沉积在传感器件表面的声表面波传播路径上的钯基气敏薄膜组成。为提升传感器响应速度,该文探讨了采用钯镍合金薄膜与钯铜纳米线作为气敏材料的氢气传感器响应特性,通过对气敏材料制备方法及参数的优化,研制了两种沉积不同钯基气敏材料的氢气传感器件,并对其性能进行了评测。实验测试结果表明:钯铜纳米线气敏材料由于具有大体积表面积比和多孔结构,大幅提高了SAW氢气传感器响应速度,针对浓度为10%、4%以及0.5%的氢气响应时间可达～2s。

Surface acoustic wave based hydrogen sensor

A hydrogen gas sensing technology with fast response, high sensitivity, and low power consumption was proposed by incorporating the palladium base materials with specific selectivity towards hydrogen gas and fast response to external perturbation of SAW devices. The developed SAW hydrogen gas sensor was composed of a differential dual-channel oscillator and a palladium base gas sensitive thin-film. To increase the response speed, palladium nickel (Pd-Ni) alloy thin-film and palladium copper (Pd-Cu) nanowire were utilized for sensing hydrogen gas, and corresponding response characteristics from the developed SAW hydrogen gas sensor were investigated, the experimental results indicate that fast response of ~2s was achieved from the Pa-Cu nanowire coated device because of the larger areavolumeratio and porous structure.