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(a) Full-scan XPS spectra of A-SiO2/N-TiO2, A-SiO2/N-TiO2@PDMS, A-SiO2/N-TiO2@PDMS after UV irradiation; A-SiO2/N-TiO2@PDMS after calcination at 400 °C; and A-SiO2/N-TiO2@PDMS after three cycles of UV irradiation and calcination. (b–f) Narrow-scan spectra of O 1s in the above spectra.
