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. 2021 Oct 21;12:6119. doi: 10.1038/s41467-021-26385-7

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — SERS spectra of methylene blue (MB) (a), crystal violet (CV) (b), rhodamine 6 G (R6G) (c), and malachite green (MG) (d) analytes on D(C₇CO)-BTBT and C₈-BTBT films. Insets depict the molecular structures of the analyte molecules. e Energy level diagram for the current analyte/o-SERS systems for D(C₇CO)-BTBT and C₈-BTBT showing the frontier molecular orbital (HOMO/LUMO) energies and plausible (shown with solid black arrow)/non-plausible (shown with dashed red arrows) transitions. µ_PICT stands for photoinduced charge-transfer between analyte and semiconductor under the excitation of 785 nm. Raman signals were produced during the transitions shown with blue solid arrows.