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Issue 42, 2014
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Probing the dynamics of plasmon-excited hexanethiol-capped gold nanoparticles by picosecond X-ray absorption spectroscopy

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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.

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

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Article information


Submitted
31 Jul 2014
Accepted
16 Sep 2014
First published
18 Sep 2014

This article is Open Access

Phys. Chem. Chem. Phys., 2014,16, 23157-23163
Article type
Paper
Author version available

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

F. Zamponi, T. J. Penfold, M. Nachtegaal, A. Lübcke, J. Rittmann, C. J. Milne, M. Chergui and J. A. van Bokhoven, Phys. Chem. Chem. Phys., 2014, 16, 23157
DOI: 10.1039/C4CP03301A

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