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SERS spectra of 4MBA-AuNPs deposited on glass slides over the 990–1,030 cm−1 spectral range. The onset of the spectral markers of the irradiation-induced decarboxylation at 996 and 1,019 cm−1 (highlighted by the arrows) is well-evident. The spectra were acquired at varying the illumination time with laser intensity of 0.56 kW/cm2 (A), 5.6 kW/cm2 (B) and 14 kW/cm2 (C). A FFT filter smoothing was applied to the spectra.
