Fig. 1

Synthesis and characterization of PtMn alloy nanoparticles. a Schematic illustration of the synthetic process for PtMn. b TEM image of PtMn-1 nanoparticles. c TEM image of PtMn-2 nanoparticles. d TEM image of PtMn-3 nanoparticles. e–g Size distribution histogram of over 100 randomly selected nanoparticles from the TEM images. e PtMn-1 nanoparticles from (b). f PtMn-2 nanoparticles from (c). g from PtMn-3 nanoparticles (d). h EDS spectra of PtMn-1. i Power XRD patterns of PtMn-1, PtMn-2 or PtMn-3. j, k XPS spectra of Pt 4f for PtMn-1, PtMn-2 or PtMn-3. h XPS spectra of Mn 2p for PtMn-1, PtMn-2 or PtMn-3