Journal article
Hysteresis-free nanoplasmonic pd-au alloy hydrogen sensors
The recent market introduction of hydrogen fuel cell cars and the prospect of a hydrogen economy have drastically accelerated the need for safe and accurate detection of hydrogen. In this Letter, we investigate the use of arrays of nanofabricated Pd-Au alloy nanoparticles as plasmonic optical hydrogen sensors.
By increasing the amount of Au in the alloy nanoparticles up to 25 atom %, we are able to suppress the hysteresis between hydrogen absorption and desorption, thereby increasing the sensor accuracy to below 5% throughout the investigated 1 mbar to 1 bar hydrogen pressure range. Furthermore, we observe an 8-fold absolute sensitivity enhancement at low hydrogen pressures compared to sensors made of pure Pd, and an improved sensor response time to below one second within the 0-40 mbar pressure range, that is, below the flammability limit, by engineering the nanoparticle size.
Language: | English |
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Year: | 2015 |
Pages: | 3563-3570 |
ISSN: | 15306992 and 15306984 |
Types: | Journal article |
DOI: | 10.1021/acs.nanolett.5b01053 |
ORCIDs: | Iandolo, Beniamino and Wagner, Jakob Birkedal |