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(A) X-ray diffractograms of the Cu2–xS nanocrystals before (HI_DDT/TOPO and HU_DDT) and after ligand exchange procedures with S2– and phase transfer to water (HI_S2–, HU_S2–). The dashed lines mark the position of the roxbyite peaks. (B) Absorption spectra of Cu2–xS nanocrystals before (HI_DDT/TOPO and HU_DDT) and after ligand exchange with S2–.
