Supporting Information
The supporting information includes the following materials: a diagram monitoring the essential microwave parameters during synthesis (Figure S1), a comparison of the substrates derived from two different batches (Figure S2), a summary of the SERS substrate morphologies after an immersion time of 1 and 4 h for the treatment with organic solvents and PBS buffers (Figure S3), the calibration curve to obtain a monolayer of 4-ATP (Figure S4), a reference Raman spectrum of 4-ATP self-assembled on a non-treated substrate (Figure S5), a table indicating the corresponding peak assignment (Table S1), a reference Raman spectrum of 4-ATP acquired on a water-treated substrate (Figure S6), EDX spectra obtained after PBS treatment at pH 5 (Figure S7 and a list summarizing the typical components of the utilized buffer systems (Table S2).
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