Aqueous Synthesis of ZnSe/ZnS-2-R-Benzothiazole Nanocrystals with White Emission

Figure 4

XPS spectra of ZnSe and ZnSe/ZnS-2-R-benzothiazole: (a) S 2p, (b) Se 3d levels of ZnSe and ZnSe/ZnS, (c) Zn 2p levels of ZnSe/ZnS-2-R-benzothiazole, and (d) total XPS spectra of ZnSe/ZnS-2-R-benzothiazole (top) and ZnSe (bottom) NCs. The ratios of S/Zn and Se/Zn of ZnSe and ZnSe/ZnS-2-R-benzothiazole are from 0.79 and 0.55 to 0.91 and 0.32.

(a)

(b)

(c)

(d)