Interfacial nature of Ag nanoparticles supported on TiO photocatalysts

Kang, Jun-Gill; Sohn, Youngku
January 2012
Journal of Materials Science;Jan2012, Vol. 47 Issue 2, p824
Academic Journal
Silver nanoparticles supported on anatase TiO nanoparticles have been prepared by deposition-precipitation, and characterized by X-ray photoelectron spectroscopy, including scanning electron microscopy, X-ray diffraction crystallography, Raman, and UV-visible absorption spectroscopy. The Ag 3 d peak and the X-ray diffraction patterns show characteristics of purely metallic Ag, with no indication of Ag oxide species. Depth-profiling X-ray photoelectron spectroscopy with Ar ion beam sputtering show a significant change in Ti 2 p, and an asymmetric broadening of Ag 3 d to a higher binding energy side. A decrease in major Ti 2 p at 459.2 eV and a significant increase in lower binding energy peak are due to change in oxidation state of Ti from +4 to +3/+2. A broadening of Ag 3 d peak with sputtering time is tentatively assigned to a final state quantum size effect. Upon annealing the deposition-precipitation sample, no significant change in Ag 3 d peak is observed, while Ti 2 p and O 1 s XPS intensities are reduced, plausibly due to change in analyzed surface area for TiO. The photocatalytic activity for the photodegradation of methyl orange is dramatically reduced upon high Ag-loading, compared to bare TiO. The X-ray photoelectron spectroscopy of Ag on TiO prepared by an electrochemical deposition reveals that Ag is also metallic, with no evidence of an oxide form. Upon annealing the electrodeposited sample, the Ag 3 d peak shifts by +0.3 eV, while the Ti 2 p and O 1 s show no critical change in intensity and peak position.


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