SEM images of the evolution process (a–e), (f) a schematic illustration of the formation of octahedral shape Mn3O4 nanoparticles corresponding to the SEM images. “Reprinted from Small, 7(4), Li, Y., Haiyan, T., Yang, X., Goris, B., Verbeeck,J., Bals, S., Colson, P., Cloots, R., Tendeloo, G., Su, B., 475–483., Well shaped Mn3O4 nano-octahedra with anomalous magnetic template and enhanced photodecomposition properties, copyright (2011), with permission from The Wiley-VCH Verlag GmbH & Co. KGaA.