Fig. 2: Physicochemical properties of the Ag@PDA-(CSPBA/CSGA) hydrogel.

a FTIR spectra and (b) XPS spectra of the CS, CSGA and CSPBA. c 1H NMR spectra of CSGA and CSPBA. d TEM image of the Ag@PDA nanoparticles. e XPS spectra of the PDA and Ag@PDA nanoparticles. f XRD patterns of the PDA and Ag@PDA nanoparticles. g SEM images of the Ag@PDA-(CSPBA/CSGA) hydrogels containing 0.15, 0.45 or 0.90 mg/mL of Ag@PDA nanoparticles.