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. 2020 Apr 14;11:1785. doi: 10.1038/s41467-020-15484-6

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© The Author(s) 2020

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. 3 — a NIR irradiation-induced SERS spectra of the 4MBA/Ag/Ag-doped TiO₂ hybrid system; b NIR irradiation-induced SERS spectra of the 4MBA/Ag/Ag-doped TiO₂ hybrid system after 2 h relaxation without irradiation; c Temporal evolutions of the Raman peak intensities at 88, 148, 364, 1078, and 1587 cm⁻¹. Phase I: the SERS signals under continuous irradiation (100 s); phase II: after 2 h relaxation without irradiation and then under continuous irradiation (80 s). Here, the temporal evolutions of other bands of 4MBA, such as 525, 718, and 842 cm⁻¹, are not displayed due to their relative weak signal and same trends.