Optimizing STEM Imaging Conditions Towards Reliable Representation of Single Atom Catalysts

catalysts (SACs) are emergent catalysts whose active sites are present as isolated metal Probing atom dispersion and their interactions with each other and with support, especially the formation of dimers, trimers, or even clusters, is the key to understanding the catalytic properties of such as activity and stability. Scanning transmission electron microscopy (STEM) high-angle annular dark-field (HAADF) imaging used to image single atom distributions. that single atoms on a support can be activated by an incident beam to diffuse along the surface the question of how reliable the acquired positions might be. In this work, we aim to investigate the mechanism of beam irradiation in single atom heterogeneous catalysts and identify the optimum experimental conditions. In particular, we evaluate how electron dose, dose rate, voltage and cryogenic temperature impact beam irradiation on SACs. In study, we 3 (Pt/g-C 3 as a This system shows great for and catalysis and of a large family of heterogenous containing precious single atoms on amorphous The polymeric and semiconducting nature of C 3 N it potentially to multiple irradiation processes,