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(a) Cu2+ concentration-dependent SERS spectra of DDTC on AuNPs in distilled water. (b) A magnified view of the spectral region from 1380 to 1600 cm−1. (c) Three independent measurements of Raman intensities of vibrational bands at ~1504 cm−1 were performed to provide the standard deviations and a linear fit for the concentration range between 1 and 60 μM.
