Laser-driven phase transitions in aqueous colloidal gold nanoparticles under high pressure: picosecond pump-probe study

Physical Chemistry Chemical Physics : PCCP
Shuichi HashimotoHiroshi Miyasaka

Abstract

Pump-probe transient extinction spectroscopy was used to analyze 355 nm picosecond laser heating-induced phenomena in 60 nm-diameter aqueous gold nanoparticles (AuNPs) under a high pressure of 60 MPa. Kinetic spectroscopy revealed that a supercritical layer surrounding the AuNP nucleated with a lifetime of approximately 1 ns during its dynamic expansion and decay for a fluence of 19.6 mJ cm(-2). Moreover, in the post-mortem transmission electron micrographs we observed a number of fragments, a small percentage of size-reduced cores, and erupted particles among the intact particles after 60 shots, suggesting that evaporation occurred under laser illumination. The particle temperature calculation indicated that evaporation begins with a liquid droplet AuNP surrounded by a supercritical layer at temperatures below the boiling point of gold. By applying high pressure, we obtained a clear picture of the evaporation event, which was not possible at ambient pressure because bubble formation caused particle temperatures to rise uncontrollably. In this study, we shed light on the critical role of the supercritical layer formed around the AuNP under high pressure during laser-induced evaporation.

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Citations

Mar 1, 2017·Physical Chemistry Chemical Physics : PCCP·Robin Schürmann, Ilko Bald
Nov 20, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Vincenzo AmendolaOsman M Bakr
Oct 5, 2018·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Natalie TarasenkaGediminas Račiukaitis
Feb 26, 2020·Physical Chemistry Chemical Physics : PCCP·Anna Rosa ZiefussAnton Plech
Apr 21, 2020·Chemistry : a European Journal·Vincenzo AmendolaStephan Barcikowski
Dec 20, 2020·Journal of Controlled Release : Official Journal of the Controlled Release Society·Ali Shakeri-ZadehHadi Samadian
Jun 3, 2021·Chemical Reviews·Ryland C ForsytheAstrid M Müller

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