Xianyu, Y;
Lin, Y;
Chen, Q;
Belessiotis‐Richards, A;
Stevens, MM;
Thomas, MR;
(2021)
Iodide‐Mediated Rapid and Sensitive Surface Etching of Gold Nanostars for Biosensing.
Angewandte Chemie
, 60
(18)
pp. 9891-9896.
10.1002/ange.202017317.
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Abstract
Iodide‐mediated surface etching can tailor the surface plasmon resonance of gold nanostars through etching of the high‐energy facets of the nanoparticle protrusions in a rapid and sensitive way. By exploring the underlying mechanisms of this etching and the key parameters influencing it (such as iodide, oxygen, pH, and temperature), we show its potential in a sensitive biosensing system. Horseradish peroxidase‐catalyzed oxidation of iodide enables control of the etching of gold nanostars to spherical gold nanoparticles, where the resulting spectral shift in the surface plasmon resonance yields a distinct color change of the solution. We further develop this enzyme‐modulated surface etching of gold nanostars into a versatile platform for plasmonic immunoassays, where a high sensitivity is possible by signal amplification via magnetic beads and click chemistry.
| Type: | Article |
|---|---|
| Title: | Iodide‐Mediated Rapid and Sensitive Surface Etching of Gold Nanostars for Biosensing |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/ange.202017317 |
| Publisher version: | https://doi.org/10.1002/anie.202017317 |
| Language: | English |
| Additional information: | © 2021 The Authors. Angewandte Chemie published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | gold nanostar, horseradish peroxidase, iodide, plasmonic immunoassay, surface etching |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10125345 |
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