Figure 4.
SEM images of NW@PDA fabrics after immersing in [Ag(NH3)2]+ solution for (a) 4, (b) 8, and (c) 12 h. (d–f) Surface-enhanced Raman scattering (SERS) spectra of crystal violet (CV) collected on the 4, 8, and 12 h NW@PDA@AgNPs fabrics.
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