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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 1.

Figure 1.

Averaged SERS spectra of PYO at pH 2.4 (blue), 5 (red), 7 (yellow), and control spectrum (purple). Five spectra were averaged for each pHs. The control spectrum was acquired using the same concentrations of ethanol and AgNP but without PYO.