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. 2022 Nov 15;15(22):8091. doi: 10.3390/ma15228091

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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(a) R6G SERS yield (intensity of the bands at 612 and 1652 cm⁻¹) statistically averaged over measurements from 16 randomly chosen isolated Ag-Si microspheres produced at AgNO₃ concentrations of 5 × 10⁻⁴ M. (b) Series of time-resolved SERS spectra of the PATP capping the isolated Ag-Si microsphere. Total laser exposure time ranging from 6 to 120 s is indicated near each spectrum. (c) Evolution of the intensity of the characteristics DMAB-related Raman band at 1439 cm⁻¹ as a function of laser exposure time indicating PATP-to-DMAB conversion dynamics.