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. Author manuscript; available in PMC: 2021 Mar 29.
Published in final edited form as: Langmuir. 2019 May 14;35(21):7043–7049. doi: 10.1021/acs.langmuir.9b00184

Figure 2.

Figure 2.

SERS spectra of PYO at pH 7 (a) and pH 2.4 (c) as a function of applied potential and corresponding CV of PYO at pH 7 (b) and pH 2.4 (d). All spectra were obtained at an integration time of 0.5 s with 10 accumulations, and potentials were applied for 20 s. At pH 7, oxidizing potential, red dashed line in (b), Eox = −0.2 V, and reducing potential, yellow dashed line in (b), Ered = −0.5 V, both vs Ag/AgCl, were applied. At pH 2.4, oxidizing potential, red dashed line in (d), Eox = 0.05 V and reducing potential, yellow dashed line in (d), Ered = −0.35 V, both vs Ag/AgCl, were applied.