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SEM images of fluorescent SF-FS nanofibers with different SF and FS concentrations. The concentration of SF was (a) 6.0 wt%, (b) 8.0 wt%, and (c–e) 10.0 wt%. The concentration of FS was (a–c) 1.0 wt%, (d) 0.5 wt%, and (e) 2.0 wt%, respectively. (f) Pure SF nanofibers with 6.0 wt% SF concentration.
