Issue 24, 2023

Plasmonic nanoparticle etching-based optical sensors: current status and future prospects

Abstract

Plasmonic nanoparticles are an emerging tool for developing label-free multicolorimetric sensors for biosensing and chemosensing applications. The color absorbed by nanoparticles from visible light is influenced by their size, shape, orientation, and interparticle distance. Differently sized and shaped gold and silver nanoparticles exhibit a wide range of colors, aiding in the development of label-free sensors. Etching is the process of oxidizing nanoparticles, which alters their aspect ratio, shape, plasmonic peak, and outward appearance. It is typically used to create sensitive sensing platforms. Through etching, analytes could be detected in a simple, sensitive, and selective manner. The multicolor readout of nanoparticle etching-based multicolorimetric sensors can overcome the limitations of conventional colorimetric assays and improve the accuracy of visual inspection. This review discusses different approaches for target sensing using nanoparticle etching strategies like direct etching, enzyme-mediated etching, chemical reaction-driven etching, and anti-etching-based sensors and their mechanisms. In the future, etching strategies could be modified into portable sensing devices to detect a variety of analytes, which will aid in the development of on-time, in situ, and point-of-care sensing systems.

Graphical abstract: Plasmonic nanoparticle etching-based optical sensors: current status and future prospects

Article information

Article type
Critical Review
Submitted
21 jul 2023
Accepted
12 okt 2023
First published
13 okt 2023

Analyst, 2023,148, 6188-6200

Plasmonic nanoparticle etching-based optical sensors: current status and future prospects

E. T. Athira and J. Satija, Analyst, 2023, 148, 6188 DOI: 10.1039/D3AN01244A

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