Issue 4, 2022

SERS tags derived from silver nanoparticles and aryl diazonium salts for cell Raman imaging

Abstract

The surface functionalization of silver nanoparticles (NPs) by Raman reporters has stimulated a wide interest in recent years for the design of Surface-Enhanced Raman Spectroscopy (SERS) labels. However, silver NPs are prone to oxidation and aggregation, which strongly limits their applications. The design of stable SERS tags based on Ag NPs still represents a major challenge for Raman bioimaging. We address this issue herein by taking advantage of aryl diazonium salt chemistry to obtain stable Ag NPs functionalized by multifunctional polyaryl layers bearing different Raman reporters (–NO2, –CN, –CCH). The resulting SERS-encoded Ag NPs were characterized by UV-vis absorption, transmission electron microscopy (TEM) and SERS. The formation of multilayers at the surface of Ag NPs gives access to new spectrally distinguishable SERS codes thus broadening the library of available Raman tags. Proof-of-concept Raman imaging experiments were performed on cancer cells (HeLa) after NP uptake, highlighting the large potentials of diazonium salt chemistry to design Ag NPs-based SERS labels for Raman bioimaging.

Graphical abstract: SERS tags derived from silver nanoparticles and aryl diazonium salts for cell Raman imaging

Supplementary files

Article information

Article type
Paper
Submitted
16 may 2021
Accepted
04 yan 2022
First published
06 yan 2022

Nanoscale, 2022,14, 1452-1458

SERS tags derived from silver nanoparticles and aryl diazonium salts for cell Raman imaging

D. Li, P. Nizard, D. Onidas, A. Lamouri, J. Pinson, S. Mahouche-Chergui, K. Aubertin, F. Gazeau, Y. Luo and C. Mangeney, Nanoscale, 2022, 14, 1452 DOI: 10.1039/D1NR03148A

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