Characterizing planar SERS substrates: unraveling the link between physical characteristics and performance metrics

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Abstract

Surface-enhanced Raman spectroscopy (SERS) is a powerful optical sensing technique used in various applications, including medicine, microbiology, and environmental analysis. Planar SERS substrates are of particular interest due to their ease of integration in lab-on-chips and better reproducibility compared to colloidal SERS. The performance of these SERS substrates is quantified using metrics such as enhancement factor, sensitivity, and reproducibility. However, there is yet to be a consensus on how to practically compare and interpret such metrics in publications and experiments. These performance metrics are strongly influenced by the nanostructures' material, architecture, element sizes, as well as the circumstances surrounding the experiments. Understanding the effect of these characteristics on the SERS substrates' performance could not only enable a better performance but also direct their development for different applications. Thus, we prepared a planar SERS-substrate characterization methodology to explore the correlation between the nanostructures' physical characteristics and the performance metrics through coordinate-transformed spectroscopic measurements over structure-characterized areas. Seven commercial SERS substrates, with various surface architectures fabricated using different fabrication technologies, were studied using this benchmarking methodology. The results demonstrated how this methodology can indicate a SERS substrate's suitability for a specific application, thus, guiding the substrate's further adaptations or development.
Original languageEnglish
Article number025002
Pages (from-to)1-12
Number of pages12
JournalJournal of Physics: Photonics
Volume6
Issue number2
DOIs
Publication statusPublished - 1 Apr 2024

Bibliographical note

Funding Information:
The authors acknowledge Funding by the European Union within the Horizon Europe Program, under the EIC Pathfinder Project ‘VortexLC’, Grant Agreement No. 101047029. This work was also supported in part by the Methusalem and Hercules foundations and the OZR of the Vrije Universiteit Brussel (VUB).

Publisher Copyright:
© 2024 The Author(s). Published by IOP Publishing Ltd.

Keywords

  • ENHANCED RAMAN-SCATTERINGSPECTROSCOPY

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