Figure 3

PEG-labeled AuNPs localized on the surface of the nanofiber. A few plain AuNPs localized sporadically on the nanofiber surface through electrospinning (a). To enhance stability and surface localization, AuNPs were labeled with the PEG-based molecules (b), by which a 1-nm-thick layer formed (distance between the 2 red lines) on the surface of the AuNPs (c). The PEG-labeled AuNPs mainly localized on the surface of the nanofiber through electrospinning (d, e). The particles shown on the nanofibers were confirmed as gold via FFT analysis (f). The red arrows indicate AuNPs. Scale bars in each figure: A = 50 nm, C = 10 nm, D = 100 nm, and E = 5 nm.