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Gradient metal nanoislands as a unified surface enhanced Raman scattering and surface enhanced infrared absorption platform for analytics
Citation key Gkogkou2019
Author Gkogkou, Dimitra and Shaykhutdinov, Timur and Kratz, Christoph and Oates, Thomas W. H. and Hildebrandt, Peter and Weidinger, Inez M. and Ly, Khoa Hoang and Esser, Norbert and Hinrichs, Karsten
Pages 5271-5276
Year 2019
DOI 10.1039/C9AN00839J
Journal Analyst
Volume 144
Publisher The Royal Society of Chemistry
Abstract In the last few decades, the use of plasmonics in vibrational spectroscopy has expanded the scope of (bio)analytical investigations. Nevertheless, there is a demand for a combined platform that can be simultaneously efficient for Surface Enhanced Raman Scattering (SERS) and Surface Enhanced Infrared Absorption (SEIRA). Here, we present a solution on the basis of a plasmonic Ag nanoparticle layer with a thickness gradient. The optical resonance along the layer varies from the visible to the infrared range offering optimal and intermediate sites for SERS and SEIRA of the analyte molecule (mercaptobenzonitrile). Enhancement factors for the same mode were determined to be ca. 104 and 170 for SERS and SEIRA, respectively. We present a full optical and vibrational characterization and demonstrate further tunability. The platform resolves reproducibility and comparability issues by a combination of the two methods. It also offers individualized solutions for different investigation conditions, i.e. a choice between excitation wavelengths and resonant Raman molecules. The multiple applicabilities of the presented unifying substrate can contribute to the expansion of the vibrational spectroscopic field and to analytics.
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