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. 2018 Aug 3;9:3065. doi: 10.1038/s41467-018-05237-x

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© The Author(s) 2018

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. 4 — SERS-based enhancement for Crystal Violet and Rhodamine 6G. Significant enhancement ~10⁶ was achieved with ZnO-based semiconductor quantum probe, which is outstanding for a non-plasmonic material. Concentration-based SERS spectra of Crystal Violet (a) and R6G (b). The “x” axis of the spectra display Raman Shift (cm⁻¹) and “y” axis displays arbitrary units. Bar chart represents enhancement factor with reference to the concentration (c). Scale bar for SEM 500 nm and for TEM = 20 nm