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. 2017 Aug 17;7:8561. doi: 10.1038/s41598-017-09308-9

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© The Author(s) 2017

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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GERS spectra of Sudan III molecule. (a) The PPF+Ni process temperature dependence to the resulting GERS enhancement shows remarkable difference between sample fabricated at 700 °C and 800 °C. (b) Raman spectra for the PPF+Ni and PPF fabricated at 800 °C (averaged over the substrate surface). (c) Optical microscope image showing the boundary between PPF+Ni and PPF. (d) Mapping of the Sudan III Raman peak at 1228 cm⁻¹ at the boundary between PPF+Ni and PPF substrates. In both (a and b) the spectra have been displaced for clarity.