Fig. 1. Schematic of polymerization reaction of GMA-EDMA porous material

Fig. 2. Flow chart of preparation of 3D SERS substrates and spectra collection of SERS

Fig. 3. SEM images of 3D SERS substrates. (a) Blank GMA-EDMA porous material; (b) Au-nanoparticle-absorbed GMA-EDMA porous material

Fig. 4. SERS spectra of pyrene solution (1×10-7 mol·L-1) obtained with two different substrates

Fig. 5. Raman spectra of solid phenanthrene and SERS spectra of phenanthrene solutions with different concentrations

Fig. 6. Relationship between Raman intensity at 707 cm-1 and 1351 cm-1 and concentration of phenanthrene solution

Fig. 7. Raman spectra of solid pyrene and SERS spectra of pyrene solutions with different concentrations

Fig. 8. Relationship between Raman intensity at 590 cm-1 and 1237 cm-1 and concentration of pyrene solution

Fig. 9. SERS spectra of benzo(k) fluoranthene solutions with different concentrations and Raman spectra of solid benzo(k) fluoranthene

Fig. 10. Relationship between Raman intensity at 548 cm-1 and 664 cm-1 and concentration of benzo(k) fluoranthene

Fig. 11. SERS spectra of benzo(k) fluoranthene, pyrene, phenanthrene with same concentration of 1×10-8 mol·L-1 and mixture of these three substances