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Optical properties of CTAB-CIS/ZnS NCs. (a) UV–vis absorption spectra and (b) PL spectra of CIS/ZnS NCs before (toluene dispersions) and after (aqueous dispersions) phase transfer using CTAB. Photograph of samples dispersed in different media under UV light is shown in the inset in the Figure 3b. (c) The evolution of PL intensity and (d) emission measurement after 6 months in the dark of CTAB-CIS/ZnS NCs.
