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Molecular electronics is attracting increasing attention due to its potential application in post-silicon electronics. However, fabrication of molecular junctions, the fundamental building block of molecular electronic devices, requires complicated procedures, which hamper the efficient development of novel devices. Here, we propose a simple fabrication process by utilizing an atomic switch operated by redox reaction and migration of metal atoms. The Ta2O5-based silver atomic switches were operated with a small operation voltage (0.3 V) in an acetylene atmosphere under an ultra-high vacuum. The consecutive operation of the atomic switch shows novel conductive states around 0.1 G0 (G0 = 2e2/h). Inelastic electron tunneling spectra and first-principles calculations reveal that the observed conductive states are attributed to the acetylene molecular junctions on the silver filament. The proposed method accelerates the development of devices through the marriage of molecular junctions with atomic conductive filaments.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: acetylene, atomic switch, conductive filament, inelastic electron tunneling spectroscopy, molecular electronic device, single-molecule junction

Date published: 2025-10-25

Publisher: Wiley

Journal:

• Small (ISSN: 16136810) vol. 21 issue. 47 e07653

Funding:

• Murata Science and Education Foundation
• JSPS KAKENHI 20K05445
• JSPS KAKENHI 22H04974

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1002/smll.202507653

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Updated at: 2025-12-09 16:30:55 +0900

Published on MDR: 2025-12-09 16:26:08 +0900