Abstract
The development of hydrogen compatibility is crucial for its being a new key energy source. A study of hydrogen fuse based on Pd break junction method is presented to explore the limit of sensitivity. The critical part of this device was fabricated from a Pd nanowire electrode (80 ± 20 nm) made by electron beam lithography (EBL) method. Subsequent electromigration technique is utilized to develop a controllable break junction on the nanowire (1–2 nm). This device shows reversible response cycles of hydrogen in an ultralow pressure range below 0.1±0.002 Pa and fuse-like response above 10 Pa at room temperature. The results show that the relationship between quantum conductance with hydrogen pressure was kept linear because of hydrogen absorption induced expansion of break junction. When the expansion exceeds the threshold value, the break junction gap is closed and becoming conductive. This method opens up a possibility to detect hydrogen under ultralow partial pressure.
Published Version
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