Fig. 1. The molecular formula of DMMP and GB

Fig. 2. The SEM (a) and UV-Visible absorption spectrum (b) of Ag nanoparticles

Fig. 3. The normal Raman of DMMP

Fig. 4. The SERS spectra of 1 000 mg·L^-1 DMMP with different agglomerating agents

Fig. 5. The SERS spectra of 1 000 mg·L^-1 DMMP with different methods

Fig. 6. The schematic diagram of SERS detection for DMMP

Fig. 7. SERS spectra of different concentrations of DMMP