Figure 4.
UV–Vis absorption spectra of synthesized pure and Cr-doped ZnO NPs with various concentrations of Mb.(a) Pure ZnO, (b) ZnO-Cr (Cr = 13 × 1017 atoms/cm3), (c) ZnO-Cr (Cr = 20 × 1017 atoms/cm3), and (d) ZnO-Cr (Cr = 32 × 1017 atoms/cm3).
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