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In situ structural kinetics of picosecond laser-induced heating and fragmentation of colloidal gold spheres

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Abstract

Fragmentation of colloidal 54 nm gold nanoparticles by picosecond laser pulses is recorded by time-resolved X-ray scattering, giving access to structural dynamics down to a 80 ps resolution. Lattice temperature and energy dissipation have been quantified to verify that the maximum applied fluence of 1800 J m−2 heats up the particles close to boiling. Already within 30 ns, particles with significantly lower particle sizes of 2 to 3 nm are detected, which hints towards an ultrafast process either by a thermal phase explosion or Coulomb instability. An arrested growth is observed on a microsecond time scale resulting in a final particle size of 3–4 nm with high yield. In this context, the fragmentation in a NaCl/NaOH solution seems to limit growth by electrostatic stabilization of fragments, whereas it does not modify the initial product sizes. The laser-induced fragmentation process is identified as a single-step, instantaneous reaction.

Graphical abstract: In situ structural kinetics of picosecond laser-induced heating and fragmentation of colloidal gold spheres

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Article information


Submitted
20 Sep 2019
Accepted
14 Feb 2020
First published
14 Feb 2020

This article is Open Access

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

In situ structural kinetics of picosecond laser-induced heating and fragmentation of colloidal gold spheres

A. R. Ziefuss, S. Reich, S. Reichenberger, M. Levantino and A. Plech, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/C9CP05202J

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