Figure 4

(a) SERS spectra of ternary mixture sample A4 to A7. (b) Plot of PCA scores for 1, 4-BDT, 4-MBA, 4-MPY, and their ternary mixture sample A4 to A7. (c) Plot of real composition in solution versus composition predicted by PCA. (d) Plot of real composition in solution versus composition of corrected PCA predictions.