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FTIR (a–b) and XPS (c–d) spectra of AgNPs powder, DDP powder, PCL fiber film, PCL-AgNPs fiber film, PCL-DDP fiber film and PCL-DDP-AgNPs fiber film, respectively. EDS spectrum (e) and elemental mapping (f, g) of PCL-DDP-AgNPs fiber films. Scale bar, 2.5 μm.
