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pH and time dependence of SER spectra of MB.
Notes: (A) pH dependence of SER spectra of MB acquired using as substrates 1 mL OH AuNPs. (B) Time-dependent SER spectra of MB acquired using as substrates 1 mL OH AuNPs. The spectra were recorded using a 785 nm excitation laser. The arrows indicate the precise position of the vibrational bands.
Abbreviations: SER, surface-enhanced Raman; MB, methylene blue; OH, Origanum herba; AuNP, gold nanoparticle; au, atomic unit.
