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Probing the dynamics of plasmon-excited hexanethiol-capped gold nanoparticles by picosecond X-ray absorption spectroscopy

Lookup NU author(s): Dr Thomas Penfold

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Abstract

Picosecond X-ray absorption spectroscopy (XAS) is used to investigate the electronic and structural dynamics initiated by plasmon excitation of 1.8 nm diameter Au nanoparticles (NPs) functionalised with 1-hexanethiol. We show that 100 ps after photoexcitation the transient XAS spectrum is consistent with an 8% expansion of the Au–Au bond length and a large increase in disorder associated with melting of the NPs. Recovery of the ground state occurs with a time constant of ∼1.8 ns, arising from thermalisation with the environment. Simulations reveal that the transient spectrum exhibits no signature of charge separation at 100 ps and allows us to estimate an upper limit for the quantum yield (QY) of this process to be <0.1.


Publication metadata

Author(s): Zamponi F, Penfold TJ, Nachtegaal M, Lubcke A, Rittmann J, Milne CJ, Chergui M, vanBokhoven JA

Publication type: Article

Publication status: Published

Journal: Physical Chemistry Chemical Physics

Year: 2014

Volume: 16

Issue: 42

Pages: 23157-23163

Print publication date: 01/10/2014

Online publication date: 18/09/2014

Acceptance date: 16/09/2014

ISSN (print): 1463-9076

ISSN (electronic): 1463-9084

Publisher: Royal Society of Chemistry

URL: http://pubs.rsc.org/en/Content/ArticleLanding/2014/CP/C4CP03301A#!divAbstract

DOI: 10.1039/C4CP03301A


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