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(a) Schematic of the ligand-exchange reaction at the surface of PbS NCs: oleate ions are replaced with Te2–; partial S2–-to-Te2– anion exchange also occurs. K-ions occupy Pb sites in the final solid. (b) HRTEM images after the surface treatment with K2Te for 17 h, displaying Moiré fringers and crystallographic maps showing the core–shell PbS@PbTe structure. (c) Lower resolution TEM images after treatment with K2Te (top) and Te-complexes (bottom) for 17 h.
