Effects of titania surface structure on the nucleation and growth of Pt nanoclusters on rutile TiO2(110)
A comparative study was conducted on the interaction of Pt with the (1x1) and (1x2) surface phases of rutile TiO{sub 2}(110). It was found that the surface structure and stoichiometry of TiO{sub 2} have profound effects on the formation and growth of nano-sized Pt clusters on TiO{sub 2}(110). On the (1x1) surface, Pt formed randomly-distributed, three-dimensional nanoclusters that coalesced and were encapsulated when thermally annealed. In contrast, smaller Pt clusters were identified to adsorb on top of the titanium atomic rows on the (1x2) surface and exhibited higher thermal stability. The stronger interaction observed for the Pt on the (1x2) surface is due to a charge transfer from Ti to Pt atoms. Vicinal TiO{sub 2}(110) surfaces with alternating (1x1) and (1x2) domains were used to verify the different interactions of Pt for the two domains. Upon Pt deposition, an array of self-organized Pt nanoclusters was formed on this surface. The self-organization is due to different interactions of Pt with the two different surface domains and preferential diffusion of Pt nanoclusters along the titanium atomic rows on the (1x2) surface.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1033472
- Report Number(s):
- PNNL-SA-33811; KJ0200000
- Journal Information:
- Surface Science, Journal Name: Surface Science Journal Issue: 1-3 Vol. 475; ISSN SUSCAS; ISSN 0039-6028
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of Platinum Nanocluster Size and Titania Surface Structure upon CO Surface Chemistry on Platinum-Supported TiO2 (110)
Nucleation and growth of Pt nanoparticles on reduced and oxidized rutile TiO{sub 2} (110)