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Issue 11, 2011
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Surface-enhanced ATR-IR spectroscopy with interface-grown plasmonic gold-island films near the percolation threshold

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Abstract

Flat nano-island films prepared by wet-chemical deposition were investigated with attenuated total reflection infrared (ATR-IR) spectroscopy and scanning electron microscopy (SEM) in order to analyze the correlation between film morphology and optical properties. Here we choose Au as representative coinage metal (Au, Ag, Cu) that shows strong structure-dependent surface-enhanced infrared absorption (SEIRA). Infrared spectra of octadecanethiol monolayers on films of different stages of morphologic development show effects that are characteristic for SEIRA, such as enhanced vibrational signals, Fano-type line shape, and adsorbate induced baseline shifts. Their extent was found to be strongly dependent on the structural details and the strongest enhancement occurs at the percolation threshold of the two-dimensional island system. Also films beyond percolation show significant enhancement due to residual nanoholes that are acting as hotspots.

Graphical abstract: Surface-enhanced ATR-IR spectroscopy with interface-grown plasmonic gold-island films near the percolation threshold

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Article information


Submitted
08 Aug 2010
Accepted
13 Jan 2011
First published
03 Feb 2011

Phys. Chem. Chem. Phys., 2011,13, 4935-4941
Article type
Paper

Surface-enhanced ATR-IR spectroscopy with interface-grown plasmonic gold-island films near the percolation threshold

D. Enders, T. Nagao, A. Pucci, T. Nakayama and M. Aono, Phys. Chem. Chem. Phys., 2011, 13, 4935
DOI: 10.1039/C0CP01450H

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