Figure 1

Characterization of the synthesized AuNP-PEIs (a) UV–vis absorption spectrum, (b) Particle size distribution with DLS, (c) Representative FE-SEM images, (inset: image with higher resolution), (d) Histogram for particle size distribution and Gaussian fitted curve, and (e) ATR-FTIR spectra of PEIs and AuNP-PEIs.