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Bacteria Raman signals and spectra of S. aureus. (a) The bacteria solution with different AgNP concentrations of 2.5 × 10-7, 5 × 10-7, and 1 × 10-6 mg/μl was adjusted to investigate the optimal AgNP condition for SERS resulting in an optimal AgNP concentration being found at 5 × 10-7 mg/μl. (b) Spectra of S. aureus that were detected via the amplified DEP AgNP-enhanced Raman five runs using five different chips.
