Single-molecule detection with enhanced Raman scattering of tungsten oxide nanostructure?

Nanoscale Pub Date: 2022-09-23 DOI: 10.1039/D2NR03596K

Abstract

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.

Graphical abstract: Single-molecule detection with enhanced Raman scattering of tungsten oxide nanostructure
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