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Fast, sensitive hydrogen gas detection using single palladium nanowires that resist fracture.
- Source :
-
Nano letters [Nano Lett] 2009 May; Vol. 9 (5), pp. 2177-82. - Publication Year :
- 2009
-
Abstract
- Two types of pure palladium (Pd) nanowires, differentiated by microstructure, were electrodeposited: (1) nanocrystalline Pd nanowires (grain diameter approximately 5 nm, henceforth nc5-Pd) and (2) nanocrystalline Pd nanowires with a grain diameter of 15 nm (nc15-Pd). These nanowires were evaluated for the detection of hydrogen gas (H(2)). Despite their fundamental similarities, the behavior of these nanowires upon exposure to H(2) was dramatically and reproducibly different: nc5-Pd nanowires spontaneously fractured upon exposure to H(2) above 1-2%. Fractured nanowires continued to function as sensors for H(2) concentrations above 2%, actuated by the volume change associated with the alpha to beta phase transition of PdH(x). nc15-Pd nanowires, in contrast, withstood repeated exposures to H(2) up to 10% without fracturing. nc15-Pd nanowires showed a rapid (2 s at 10%) increase in resistance in the presence of H(2) and a response that scaled smoothly with [H(2)] spanning 5 orders of magnitude down to 2 ppm.
Details
- Language :
- English
- ISSN :
- 1530-6992
- Volume :
- 9
- Issue :
- 5
- Database :
- MEDLINE
- Journal :
- Nano letters
- Publication Type :
- Academic Journal
- Accession number :
- 19391610
- Full Text :
- https://doi.org/10.1021/nl9008474