Fig. 4

TEM images and size histograms of AC-AuNPs. a, b 0.015 %. c, d 0.025 %. e, f 0.035 %. g, h 0.045 %. i, j 0.055 %. The scale bar represents 100 nm in each image. Randomly selected nanoparticles in TEM images were used for constructing size histograms. Numbers of discrete nanoparticles selected from each images were a 100, c 102, e 101, g 106, and i 104