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

Ziefuß, Anna; Reich, Stefan; Reichenberger, Sven; Levantino, Matteo; Plech, Anton

Fragmentation of colloidal 54 nm gold nanoparticles by picosecond laser pulses is recorded by timeresolved 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.

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Verlagsausgabe §
DOI: 10.5445/IR/1000117392
Veröffentlicht am 27.02.2020
DOI: 10.1039/C9CP05202J
Zitationen: 10
Zitationen: 13
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1463-9076, 1463-9084
KITopen-ID: 1000117392
HGF-Programm 56.03.20 (POF III, LK 01) Nanoscience a.Material f.Inform.Technol.
Erschienen in Physical chemistry, chemical physics
Verlag Royal Society of Chemistry (RSC)
Band 22
Seiten 4993-5001
Vorab online veröffentlicht am 14.02.2020
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