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　We have found that tungsten oxide nanorods have a very large enhancement effect on Raman scattering. The nanorods with adsorbed 12CO and 13CO at the ratio of 1:1 were dispersed on a Si substrate and Raman mapping was performed. The Raman images of 12CO and 13CO were completely different, indicating that a very small number of molecules at the single-molecule level were observed. We also confirmed the characteristic blinking phenomenon when single-molecule detection was performed. The very large enhancement effect of Raman scattering can be attributed to the {001}CS structure of the tungsten oxide nanorods. It was confirmed from the DFT calculation results that the {001}CS structure exhibits two-dimensional electrical conduction properties.

Rights:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

Keyword: WOx nanorod, Raman enhancement, single-molecule detection, DFT calculation

Date published: 2022-09-23

Publisher: Royal Society of Chemistry (RSC)

Journal:

• Nanoscale (ISSN: 20403372) vol. 14 issue. 39 p. 14552-14557

Funding:

• National Institute for Materials Science
• Japan Society for the Promotion of Science 20K05280

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

MDR DOI:

First published URL: https://doi.org/10.1039/d2nr03596k

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Updated at: 2024-09-18 12:30:23 +0900

Published on MDR: 2024-09-18 12:30:23 +0900