Surface enhanced Raman scattering (SERS) can increase Raman signal efficiently.

To investigate the performance of SERS chip, rhodamine 6G (R6G) can select as a probe molecule.

(a) The SERS spectra of the R6G (10^-6 M) from 5 randomly selected spots on the silicon substrate with Ag nanoparticles. 

(b) The SERS spectra of R6G (10^-6 M) before and after the irradiation of UV light in 3 cycles on the silicon substrate with Ag nanoparticles.

(a) The SERS spectra of the different concentrations of melamine absorbed on the silicon substrate with Ag nanoparticles from 10^-6 to 10^-9 M. 

(b) The SERS spectra of the melamine (10^-7 M) dispersed in different aqueous media.