All commercially available chemicals including oleic acid (OA; technical grade, 90%), lead (II) oxide (PbO; 99.9995%; Alfa Aesar), selenium shot (99.999%), trioctylphosphine (TOP; technical grade, >97%; Strem Chemicals Inc.), 1-octadecene (ODE; 90%; Sigma-Aldrich), diphenylphosphine (DPP; 98%; Sigma-Aldrich), hexane (anhydrous; ≥99%; Sigma-Aldrich), EG (anhydrous; 99.8%; Sigma-Aldrich), EDA(anhydrous; Sigma-Aldrich), and ethyl alcohol (anhydrous; 99.5%; Sigma-Aldrich) were used as received. Ultrathin carbon film (10 nm, 400 mesh)–supported copper grids were purchased from Electron Microscopy Sciences.

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