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(a) Typical transmission electron microscopy (TEM) image and (b) the corresponding particle size distributions of carboxyl ZnS/CdSe quantum dots (QDs-COOH); (c) Dynamic light scattering (DLS) correlation curves of QDs-COOH; and (d) fluorescence emission spectra and ultraviolet-visible spectroscopy (UV-VIS) spectra of QDs-COOH.
