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. 2017 Mar 7;17(3):530. doi: 10.3390/s17030530

Figure 3.

Figure 3

(A) SERS spectra of AuNPs/OPD solution in the presence of Cu2+ at different reaction times under incubation at 37 °C; (B) Plot of 10 × I1372/I1262 against different reaction times.