Hot adsorbate-induced retardation of the internal thermalization of nonequilibrium electrons in adsorbate-covered metal nanoparticles

The Journal of Physical Chemistry. B
Christophe BauerHubert H Girault

Abstract

Femtosecond transient absorption spectroscopy has been used to investigate the electron-electron scattering dynamics in sulfate-covered gold nanoparticles of 2.5 and 9.2 nm in diameter. We observe an unexpected retardation of the absolute internal thermalization time compared to bulk gold, which is attributed to a negative feedback by the vibrationally excited sulfate molecules. These hot adsorbates, acting as a transient energy reservoir, result from the back and forth inelastic scattering of metal nonequilibrium electrons into the pi orbital of the sulfate. The vibrationally excited adsorbates temporarily govern the dynamical behavior of nonequilibrium electrons in the metal by re-emitting hot electrons. In other terms, metal electrons reabsorb the energy deposited in the hot sulfates by a mechanism involving the charge resonance between the sulfate molecules and the gold NPs. The higher surface-to-volume ratio of sulfate-covered gold nanoparticles of 2.5 nm leads to a stronger inhibition of the internal thermalization. Interestingly, we also note an analogy between the mechanism described here for the slow-down of electron-electron scattering in metal nanoparticles by the hot adsorbates and the hot phonon-induced retardation...Continue Reading

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Citations

Mar 10, 2016·The Journal of Physical Chemistry Letters·Anja KöhntoppFriedrich Temps
Feb 27, 2013·Proceedings of the National Academy of Sciences of the United States of America·Kenneth O ArudaEmily A Weiss
Apr 23, 2013·Physical Chemistry Chemical Physics : PCCP·Kenneth O ArudaEmily A Weiss
Jun 15, 2020·The Journal of Chemical Physics·Haibin TangNianqiang Wu
Oct 13, 2006·Chemical Reviews·Christian Frischkorn, Martin Wolf
Oct 13, 2006·Chemical Reviews·Kazuo WatanabeHans-Joachim Freund
Dec 1, 2017·Chemical Reviews·Yuchao ZhangWei David Wei
Dec 15, 2006·The Journal of Physical Chemistry. B·Peter L RedmondLouis E Brus

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