Figure 6.

(a) UV-vis absorption spectra of ZnS nanoparticles at different CTAB concentrations. [CTAB]: (1) 0.5 mM, (2) 1 mM, (3) 1.5 mM, (4) 2 mM, (5) 2.5 mM, (6) 3 mM, (7) 3.5 mM. Inset shows dependence of wavelength corresponding to absorption shoulder of ZnS nanoparticles on CTAB concentration. (b) pH dependence of UV-absorbance corresponding to absorption shoulder of ZnS nanoparticles at 294 nm