3D Spectroscopic Tracking of Individual Brownian Nanoparticles during Galvanic Exchange

Monitoring chemical reactions in solutions at the scale of individual entities is challenging: single-particle detection requires small confocal volumes, which are hardly compatible with Brownian motion, particularly when long integration times are necessary. Here, we propose a real-time (10 Hz) hol...

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Published in:ACS nano 2022-09, Vol.16 (9), p.14422-14431
Main Authors: Nguyen, Minh-Chau, Berto, Pascal, Valentino, Fabrice, Lemineur, Jean-François, Noel, Jean-Marc, Kanoufi, Frédéric, Tessier, Gilles
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Optics
Physics
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cited_by cdi_FETCH-LOGICAL-a385t-953ccdd76ddd64eccc497302998af7e2c450abf1e1b9c0f16bab02d63fb70fe23
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Kanoufi, Frédéric
Tessier, Gilles
description Monitoring chemical reactions in solutions at the scale of individual entities is challenging: single-particle detection requires small confocal volumes, which are hardly compatible with Brownian motion, particularly when long integration times are necessary. Here, we propose a real-time (10 Hz) holography-based nm-precision 3D tracking of single moving nanoparticles. Using this localization, the confocal collection volume is dynamically adjusted to follow the moving nanoparticle and allow continuous spectroscopic monitoring. This concept is applied to study galvanic exchange in freely moving colloidal silver nanoparticles with gold ions generated in situ. While the Brownian trajectory reveals particle size, spectral shifts dynamically reveal composition changes and transformation kinetics at the single-object level, pointing at different transformation kinetics for free and tethered particles.
doi_str_mv 10.1021/acsnano.2c04792
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subjects Optics
Physics
title 3D Spectroscopic Tracking of Individual Brownian Nanoparticles during Galvanic Exchange
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