Figure 3. Physical characterization of the Zn_xS − Ag_yIn_(1−y)S₂QDs.

(A) X-ray Fluorescence analysis of one of the ZAIS QD (x = 0, y = 0.2) showing the elemental composition and relative atomic mole ratios of the constituent elements. The composition agrees to that calculated theoretically. (B) X-ray diffraction patterns of the ZAIS QDs prepared using sonochemistry. The values of x and y are indicated in the figure. Reference patterns of bulk ZnS and AgInS₂ are also shown. Broad peak width is attributed to the amorphous nature of the ZAIS QDs. (C) TEM images of one of the ZAIS QDs (x = 0, y = 0.2) clearly shows the monodispersity and narrow size distribution (n = 100). Inset shows the high resolution image of a single nanoparticle (Scale bar = 10 nm). (D) Photoluminescence spectra of select water-soluble ZAIS QDs (a: x = 0.6, y = 0.5.; b: x = 0.3, y = 0.4; c: x = 0, y = 0.2; d: x = 0, y = 0.5)