Issue 14, 2023

Flexible plasmonic nanocavities: a universal platform for the identification of molecular orientations

Abstract

The molecular orientation provides fundamental images to understand molecular behaviors in chemistry. Herein, we propose and demonstrate sandwich plasmonic nanocavities as a surface-selection ruler to illustrate the molecular orientations by surface-enhanced Raman spectroscopy (SERS). The field vector in the plasmonic nanocavity presents a transverse spinning feature under specific excitations, allowing the facile modulation of the field polarizations to selectively amplify the Raman modes of the target molecules. It does not require the knowledge of the Raman spectrum of a bare molecule as a standard and thus can be extended as a universal ruler for the identification of molecular orientations. We investigated the most widely used Raman probe, Rhodamine 6G (R6G) on the Au surface and tried to clarify the arguments about its orientations from our perspectives. The experimental results suggest concentration-dependent adsorption configurations of R6G: it adsorbs on Au primarily via an ethylamine group with the xanthene ring lying flatly on the metal surface at low concentrations, and the molecular orientation gradually changes from “flat” to “upright” with the increase of molecular concentrations.

Graphical abstract: Flexible plasmonic nanocavities: a universal platform for the identification of molecular orientations

Supplementary files

Article information

Article type
Communication
Submitted
07 3 2023
Accepted
11 3 2023
First published
14 3 2023

Nanoscale, 2023,15, 6588-6595

Flexible plasmonic nanocavities: a universal platform for the identification of molecular orientations

L. Yao, Q. Hao, M. Li, X. Fan, G. Li, X. Tang, Y. Wei, J. Wang and T. Qiu, Nanoscale, 2023, 15, 6588 DOI: 10.1039/D3NR01059G

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