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3D Spectroscopic Tracking of Individual Brownian Nanoparticles during Galvanic Exchange

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posted on 2023-01-10, 02:51 authored by Minh-Chau Nguyen, Pascal Berto, Fabrice Valentino, Jean-François Lemineur, Jean-Marc Noel, Frédéric Kanoufi, Gilles Tessier
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 the study galvanic exchange in freely-moving collo{\"i}dal 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.

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