Gold Nanoparticle Capping Layers: Structure, Dynamics, and Surface Enhancement Measured Using 2D-IR Spectroscopy

Authors

  • Paul M. Donaldson,

    1. Institute of Physical Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich (Switzerland)
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  • Peter Hamm

    Corresponding author
    1. Institute of Physical Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich (Switzerland)
    • Institute of Physical Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich (Switzerland)
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  • The authors are grateful to Jan Helbing and Thomas Feurer for helpful discussions, and Shabir Hassan for assistance with the TEM characterization of the nanoparticles. This work was supported by an advanced ERC investigator grant (DYNALLO) to P.H. and by the Swiss National Science Foundation through the NCCR network “MUST”.

Abstract

original image

Surface analysis: Two-dimensional infrared spectroscopy (2D-IR) was used to probe amide and carboxylate functional groups in the vicinity of gold nanoparticles and their aggregates. The data presented shows that the unique ability of 2D-IR spectroscopy to characterize broadening mechanisms and cross peaks offers new insights into gold nanoparticle capping layer structure and dynamics (see picture).

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