Figure 2

(a) XPS survey (left), and the enlargement of Ti 2p range (right), for the SiOx@TiO2 NPs. Core-level spectra of O 1Â s and Si 2p for the (a) SiOx, and (b) SiOx@TiO2 NPs.

(a) XPS survey (left), and the enlargement of Ti 2p range (right), for the SiOx@TiO2 NPs. Core-level spectra of O 1Â s and Si 2p for the (a) SiOx, and (b) SiOx@TiO2 NPs.