Hydrogen-gas sensing at low concentrations using extremely narrow gap palladium nanoclusters prepared by resistive spectroscopy

Nakamura, N.; Ueno, T.; Ogi, H.

Journal of Applied Physics, 2019, 126(22), 225104-1-225104-6

Number of Access:847（2025-11-25 02:20 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/83919

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Title
Hydrogen-gas sensing at low concentrations using extremely narrow gap palladium nanoclusters prepared by resistive spectroscopy
Creator
NRID
1000050452404 1000050452404
researchmap permalink
nnakamura nnakamura
Scopus Author ID
7403356186 7403356186
ORCID
0000-0002-5338-842X 0000-0002-5338-842X
CreatorName
Nakamura, N.
CreatorName
Ueno, T.
NRID
1000090252626 1000090252626
researchmap permalink
read0042771 read0042771
Scopus Author ID
35563683500 35563683500
ORCID
0000-0002-9602-5194 0000-0002-9602-5194
CreatorName
Ogi, H.
Description
Nakamura N., Ueno T., Ogi H. Hydrogen-gas sensing at low concentrations using extremely narrow gap palladium nanoclusters prepared by resistive spectroscopy. Journal of Applied Physics, 126(22), 225104 (2019) https://doi.org/10.1063/1.5119314.
Abstract
Isolated palladium nanostructures expand when they are exposed to hydrogen gas, and the gaps between them become narrower, thereby decreasing the electrical resistance. This behavior is applicable for the hydrogen-gas sensing, and several types of nanogap structures have been developed. However, the resistance change is significantly small at a low hydrogen-gas concentration because of insignificant lattice expansion. In the present study, this problem is solved by using the palladium nanoclusters with extremely narrow gaps, which is achieved by our original method, resistive spectroscopy, and hydrogen-induced structural stabilization. The nanoclusters are fabricated by interrupting deposition just before forming the continuous film, in which palladium clusters are nearly touching each other, and exposing them to hydrogen gas. In conventional studies using nanoclusters, hydrogen gas is detected through a decrease in the surface electric resistance caused by gap narrowing/closing. However, in this study, we observe an increase in the resistance when the gap distance between the cluster is extremely small, which is attributed to the restriction of electron tunneling between the palladium nanoclusters because of hydrogen adsorption on their surface. We confirm that this mechanism allows ultrahigh sensitivity hydrogen-gas sensing, achieving a limit of detection of 0.25-ppm hydrogen gas. In addition, we find that an optimized structure for the present detection mechanism is different from those in conventional sensors based on the gap-narrowing/closing mechanism.
Publisher
American Institute of Physics
Source Title
Journal of Applied Physics
Volume (Issue)
126(22)
Page
225104-1-225104-6
Date of Issued
2019-12-11
Language
English
Handle URL
https://hdl.handle.net/11094/83919
PISSN
00218979
eISSN
10897550
NCID
AA11868165
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1063/1.5119314
Access Rights
open access
CopyRight
Copyright 2019 Authors. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics, 126(22), 225104, 2019 and may be found at https://doi.org/10.1063/1.5119314.
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学術雑誌論文 Journal Article