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Supporting information may be found in the online version of this article.

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JRS_4319_sm_Figure S1.tifTIFF image660K(A) 1ppM R-NH2 or (B) R6G solution was added to silver colloids. After 2 h incubation, surface-enhanced Raman scattering nanoparticles were centrifuged. The supernatants were collected to measure absorption spectra (black line and red line for R-NH2 or R6G before and after centrifuged, respectively). The previous data showed that over 90% of R-NH2 or R6G molecules were adsorbed to the surface of silver nanoparticles.
JRS_4319_sm_Figure S2.tifTIFF image1240K(A, B) was the scanning electron microscopy of colloidal particles and 1 ppm dye molecules (pH = 3), depending on the measurement condition; (a, b) was the scanning electron microscopy of colloidal particles and 10 ppm dye molecules (pH = 3) with aggregation, which have been eliminated, respectively.
JRS_4319_sm_Figure S3.tifTIFF image446KThe normal Raman spectra of R6G and R-NH2 in the powder form. We have to acquire normal Raman spectra using solid form to demonstrate the spectroscopic signatures are indeed similar.
JRS_4319_sm_Figure S4.tifTIFF image1076KSurface-enhanced Raman (SERS) spectra of R6G and derivative at pH = 7. The concentration of R6G and derivative are the same (1 ppm) and the volume ration between molecule and silver collide was 1:9. SERS spectra obtained at 633 nm (off-resonance) laser excitation (integration time = 1 s). In both R6G and derivative, the R6G spectra are expanded by a factor of 21 for spectral details.
JRS_4319_sm_Figure S5.tifTIFF image621KSurface-enhanced Raman (SERS) spectra of R6G and derivative at pH =3. The concentration of R6G and derivative are the same (1 ppm) and the volume ration between molecule and silver nanoparticles was 1:9. SERS spectra obtained at 633 nm (off-resonance) laser excitation (integration time = 1 s). In both R6G and derivative, the R6G spectra are expanded by a factor of 34 for spectral details
JRS_4319_sm_Figure S6.tifTIFF image666KThe UV–vis spectra of R-NH2 within the pH = 9 and the pH = 3, respectively. The concentration of derivative was 10−5 mol/L.
JRS_4319_sm_Figure S7.tifTIFF image469KRelative standard deviation–surface-enhanced Raman scattering graph: a series of surface-enhanced Raman scattering spectra of dyes molecules collected on randomly 15 times of the silver dyes and the corresponding relative standard deviation (A) R6G, (B) R-NH2 of the key band 1360 cm−1, pH = 3.

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