(a)
(b)
(c)
(d)
(e)
(f)
Figure 2: TEM images of (a) SiO2, (b) SiO2@TiO2 core-shell particles, (c) 1 wt.% Ag-coated SiO2@TiO2 photocatalysts, (d) 3 wt.% Ag-coated SiO2@TiO2 photocatalysts, (e) 6 wt.% Ag-coated SiO2@TiO2 photocatalysts, and (f) 9 wt.% Ag-coated SiO2@TiO2 photocatalysts.