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SERS Background Imaging – a Versatile Tool Towards More Reliable SERS Analytics

preprint
submitted on 30.06.2020 and posted on 02.07.2020 by Paul Ebersbach, Ute Münchberg, Erik Freier
Surface-enhanced Raman scattering (SERS) is a highly selective and sensitive straightforward analytical method, which is however not yet established in routine analysis due to a lack of reliability and reproducibility. Here we utilise the broad SERS continuum background (SERS-BG) accompanying every SERS measurement as a versatile tool towards more reliable SERS analytics. We apply a heterogeneous gold SERS substrate immersed with an adenosine triphosphate solution to show that the integrated SERS-BG distinctly correlates with the intensity of the analyte signals in the SERS spectrum. Based on this relationship we introduce an easy-to-handle, automatable and more reliable SERS measurement procedure starting with fast and high-contrast imaging of the SERS substrate followed by hot spot localisation and recording of highly enhanced SERS spectra at the centre of the diffraction-limited spot. We further demonstrate the applicability of SERS-BG imaging by combining it with other optical modalities and electron microscopy to assess structure-property relationships. Additionally, we perform Monte-Carlo simulations to evaluate the sampling error in SERS experiments highlighting the advantages of our method over conventional SERS experiments.

Funding

Biotechnology2020 + Structural Projects: Leibniz Research Cluster (LRC) - Bio / Synthetic Multifunctional Micro-Production Units - Novel Pathways to Drug Development, Subproject E

Federal Ministry of Education and Research

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Ministerium für Kultur und Wissenschaft des Landes Nordrhein-Westfalen

Bundesministerium für Bildung und Forschung

History

Email Address of Submitting Author

erik.freier@isas.de

Institution

Leibniz-Institut für Analytische Wissenschaften – ISAS – e.V.

Country

Germany

ORCID For Submitting Author

0000-0002-0559-4210

Declaration of Conflict of Interest

No conflict of interest.

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