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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Bibliographic Details
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
Format: Article
Language:English
Subjects:
Optics
Physics
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Summary: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.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.2c04792