journal article

Journal Article

Applied Physics Letters. 2024, 125, p. 021902

Enhancement of hydrogen response by forming an Au submonolayer on nanogap Pd nanoparticles

AIP Publishing

2024-07-09

https://doi.org/10.1063/5.0204024

Nakamura Nobutomo, Yoshikawa Kazushi, Ishii Akio. Applied Physics Letters 125, 021902 (2024) https://doi.org/10.1063/5.0204024.

When Pd nanoparticles dispersed on a glass substrate with nanometer order gaps are exposed to H2 gas, H atoms are adsorbed on the nanoparticle surface, and the electrical resistance between the nanoparticles increases because of the tunneling current suppression. In contrast, when Au nanoparticles are exposed to H2 gas, the resistance remains unchanged because H atoms are not adsorbed on the Au surface. Considering these behaviors, the change ratio of the electrical resistance is expected to be smaller when the surface of Pd nanoparticles is partially covered with Au. However, the experimental results show the opposite resistance change. Density functional theory simulation indicates that H atoms are adsorbed and absorbed on the pure Pd surface, but H atoms are adsorbed and tend to remain on the partially covered Pd surface. These results indicate that the decrease in the resistance due to the gap narrowing by hydrogen absorption occurs in Pd nanoparticles, but it does not occur in Au/Pd nanoparticles, resulting in a larger resistivity increase compared with the Pd nanoparticles. This result implies that in certain cases, the low reactivity of Au to H2 contributes to the enhancement of the electrical resistance response.

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 Nakamura Nobutomo, Yoshikawa Kazushi, Ishii Akio. Enhancement of hydrogen response by forming an Au submonolayer on nanogap Pd nanoparticles. Applied Physics Letters 125, 282 (2024) and may be found at https://doi.org/10.1063/5.0204024.

97135

Enhancement of hydrogen response by forming an Au submonolayer on nanogap Pd nanoparticles

AIP Publishing

2024-07-09

Applied Physics Letters

125

021902

https://doi.org/10.1063/5.0204024

https://hdl.handle.net/11094/97135