Extended Data Fig. 2: Characterization of 1M (M = Pt, Pd, Ni) species.

a, UV/Vis analysis in THF at r.t. Spectra are normalized at the absorption maximum of pyrene at 341 nm. b, TEM image of Pt, Pd, and Ni-atom aggregates. c, Low-mag TEM image of single metal atoms from 1M species. d, Time–dependent diffusion of single Pt-atoms. e, Time-dependent diffusion of single Pd-atoms. Arrows indicate the direction of motion.