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PMBA (4-Mercaptobenzoic acid)

Labels (from top to bottom):
785 nm
633 nm
533 nm
Concentration:
PMBA 10-6 M

Raman spectra shows the differences between intensity of SERS signals of 10-6 M PMBA using lasers of different wavelengths on Silver Substrate.

Laser wavelength: 785 nm
Laser power:

785 nm: 1.5 mW
633 nm: 0.2 mW
533 nm: 1.5 mW

Integration time: 10 second, 3 accumulations
Raman Spectrometer: Renishaw
Lens magnification: 20x
Sampling method: immersion
Substrate used: Silver, Silver-Gold Hybrid