Center for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA.
Nanotechnology. 2010 Mar 26;21(12):125501. doi: 10.1088/0957-4484/21/12/125501. Epub 2010 Mar 2.
Palladium has been extensively studied as a material for hydrogen sensors because of the simplicity of its reversible resistance change when exposed to hydrogen gas. Various palladium films and nanostructures have been used, and different responses have been observed with these diverse morphologies. In some cases, such as with nanowires, the resistance will decrease, whereas in others, such as with thick films, the resistance will increase. Each of these mechanisms has been explored for several palladium structures, but the crossover between them has not been systematically investigated. Here we report on a study aimed at deciphering the nanostructure-property relationships of ultrathin palladium films used as hydrogen gas sensors. The crossover in these films is observed at a thickness of approximately 5 nm. Ramifications for future sensor developments are discussed.
钯因其在暴露于氢气时可逆电阻变化的简单性而被广泛研究作为氢气传感器的材料。已经使用了各种钯膜和纳米结构，并且观察到这些不同形态的不同响应。在某些情况下，例如纳米线，电阻会降低，而在其他情况下，例如厚膜，电阻会增加。这些机制中的每一种都已经在几种钯结构中进行了探索，但是它们之间的交叉尚未系统地研究过。在这里，我们报告了一项旨在破译用作氢气气体传感器的超薄钯薄膜的纳米结构-性能关系的研究。在大约 5nm 的厚度观察到这些薄膜的交叉。讨论了对未来传感器发展的影响。
