Fig. 1

TEM images of MAG1 (a), MAG2 (b), MAG3 (c), and MAG4 (d), with inset high-resolution images of single particles representative of the morphology and crystallinity of the samples. The corresponding particles’ size distributions are reported in panels e, f, g, and h for MAG1, MAG2, MAG3, and MAG4, respectively. The frequency counts of the measured size are represented as blue spheres, while the continuous red line describes the log-normal fit to the data