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Study of Surface-Enhanced Infrared Spectroscopy: 2. Large Enhancement Achieved through Metal–Molecule–Metal Sandwich Configurations

✍ Scribed by Zhijun Zhang; Toyoko Imae

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 87 KB
Volume: 233
Category: Article
ISSN: 0021-9797
DOI: 10.1006/jcis.2000.7221

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✦ Synopsis

In this paper we report a versatile and effective strategy to attain strong surface-enhanced infrared absorption by employing a sandwich system consisting of metal island films and self-assembled monolayers (SAMs) of 4-pyridinethiol. The observed larger enhancement factor stems from coupling of the electric fields induced by excitation of the surface plasmon resonance of the overlayer and underlayer Au island films, and from enhanced chemical interactions of the Au island films and the pyridine molecule in the sandwiched structures, compared to the corresponding SAM-Au configuration.

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Study of Surface-Enhanced Infrared Spectroscopy: 1. Dependence of the Enhancement on Thickness of Metal Island Films and Structure of Chemisorbed Molecules

✍ Zhijun Zhang; Toyoko Imae 📂 Article 📅 2001 🏛 Elsevier Science 🌐 English ⚖ 95 KB

The dependence of surface-enhanced infrared absorption (SEIRA) on structure and vibration modes of chemisorbates was studied in a reflection-absorption mode by employing selfassembled monolayers of 4-pyridinethiol and 4-nitrothiophenol formed on Au island films deposited on glass substrates. The pre