Kinetics and Mechanism of Metal Nanoparticle Growth via Optical Extinction Spectroscopy and Computational Modeling: The Curious Case of Colloidal Gold
| Autor: | M. Reza Andalibi, Alexander Wokaun, Paul Bowen, Andrea Testino |
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| Předmět: |
Chemical Physics (physics.chem-ph)
Condensed Matter - Materials Science Materials science Condensed Matter - Mesoscale and Nanoscale Physics Economies of agglomeration Kinetics General Engineering Nucleation General Physics and Astronomy Nanoparticle Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Metal Ultraviolet visible spectroscopy Chemical physics Colloidal gold visual_art Physics - Chemical Physics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) visual_art.visual_art_medium General Materials Science Spectroscopy |
| Popis: | An overarching computational framework unifying several optical theories to describe the temporal evolution of gold nanoparticles (GNPs) during a seeded growth process is presented. To achieve this, we used the inexpensive and widely available optical extinction spectroscopy, to obtain quantitative kinetic data. In situ spectra collected over a wide set of experimental conditions were regressed using the physical model, calculating light extinction by ensembles of GNPs during the growth process. This model provides temporal information on the size, shape, and concentration of the particles and any electromagnetic interactions between them. Consequently, we were able to describe the mechanism of GNP growth and divide the process into distinct genesis periods. We provide explanations for several longstanding mysteries, for example, the phenomena responsible for the purple-greyish hue during the early stages of GNP growth, the complex interactions between nucleation, growth, and aggregation events, and a clear distinction between agglomeration and electromagnetic interactions. The presented theoretical formalism has been developed in a generic fashion so that it can readily be adapted to other nanoparticulate formation scenarios such as the genesis of various metal nanoparticles. Comment: Main text and supplementary information (accompanying MATLAB codes available on the journal webpage) |
| Databáze: | OpenAIRE |
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