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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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Publication details

The article was received on 31 Jul 2014, accepted on 16 Sep 2014 and first published on 18 Sep 2014


Article type: Paper
DOI: 10.1039/C4CP03301A
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Citation: Phys. Chem. Chem. Phys., 2014,16, 23157-23163
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    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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