Highly Stable and Ultrafast Hydrogen Gas Sensor Based on 15 nm Nanogaps Switching in a Palladium-Gold Nanoribbons Array

Authors
Pak, YusinJeong, YeonggyoAlaal, NareshKim, HyeonghunChae, JeonghoonMin, Jung-WookDevi, Assa Aravindh SasikalaMitra, SomakLee, Da HoonKumaresan, YogeenthPark, WoojinKim, Tae-WookRoqan, Iman S.Jung, Gun-Young
Issue Date
2019-02
Publisher
WILEY
Citation
ADVANCED MATERIALS INTERFACES, v.6, no.4
Abstract
Palladium (Pd) nanogap hydrogen gas (H-2) sensors based on the large volume expansion of beta phase palladium hydride (beta-PdH) are highly promising, owing to their fast and accurate sensing capability at room temperature in air. However, such sensors do not work well at H-2 concentrations below 1%. At such low H-2 concentrations, Pd exists as alpha-PdH, which has a slow and insufficient volume expansion and cannot completely close nanogaps. Furthermore, the lattice strains induced from the phase transition (alpha-PdH -> beta-PdH) behavior degrade the stable and repeatable long-term sensing capability. Here, these issues are resolved by fabricating an array of periodically aligned alloyed palladium-gold nanoribbons (PdAu NRB) with uniform 15 nm nanogaps. The PdAu NRB sensor enables highly stable and ultrafast H-2 sensing at the full detection range of H-2 concentrations from 0.005% to 10% along with the excellent limit of detection (approximate to 0.0027%), which is sufficiently maintained even after seven months of storage in ambient atmosphere. These breakthrough results will pave the way for developing a practical high-performance H-2 sensor chip in the future hydrogen era.
Keywords
SELF-ASSEMBLED MONOLAYER; ELECTRICAL-RESISTANCE; H-2 SENSORS; THIN-FILMS; SNO2; PD; NANOSTRUCTURES; TRANSITION; DYNAMICS; hydrogen gas sensors; nanoribbon; palladium nanogap; polystyrene thermal shrinkage
ISSN
2196-7350
URI
https://pubs.kist.re.kr/handle/201004/120383
DOI
10.1002/admi.201801442
Appears in Collections:
KIST Article > 2019
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