3D Spectroscopic Tracking of Individual Brownian Nanoparticles during Galvanic Exchange - Sorbonne Université
Article Dans Une Revue ACS Nano Année : 2022

3D Spectroscopic Tracking of Individual Brownian Nanoparticles during Galvanic Exchange

Résumé

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 colloïdal 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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Dates et versions

hal-03777501 , version 1 (14-09-2022)

Identifiants

Citer

Minh-Chau Nguyen, Pascal Berto, Fabrice Valentino, Jean-François Lemineur, Jean-Marc Noel, et al.. 3D Spectroscopic Tracking of Individual Brownian Nanoparticles during Galvanic Exchange. ACS Nano, 2022, ⟨10.1021/acsnano.2c04792⟩. ⟨hal-03777501⟩
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