Figure 12.

a, b TEM images of gelatin-Ag–AuNPs with different ratios of silver to gold synthesized at 80°C. a n_Ag/n_Au = 2.4, : 2 mL, : 1 mL; b n_Ag/n_Ag = 1.2, : 2 mL, : 2 mL, the inset in b is magnification of the image marked by pane in b; c UV–vis spectra of Ag–AuNPs, AgNPs and AuNPs. (1) AgNPs (C_gelatin: 0.4 wt%, : 2 mL), (2) Ag–AuNPs in Figure 12a, (3) Ag–AuNPs in Figure 12b, (4) AuNPs (C_gelatin: 0.4 wt%, : 2 mL); d XRD of gelatin-Ag–AuNPs film dried at room temperature under vacuum. Peaks marked with stars arise from gelatin organic phase.