AVS 57th International Symposium & Exhibition
    Surface Science Friday Sessions
       Session SS-FrM

Paper SS-FrM2
Effect of Ti Dopant in Ceria on the Structure of Metal Nanoparticles

Friday, October 22, 2010, 8:40 am, Room Santa Ana

Session: Reactivity of Oxides, Mainly TiO2
Presenter: J. Zhou, University of Wyoming
Authors: Y. Zhou, University of Wyoming
J. Zhou, University of Wyoming
Correspondent: Click to Email
Ceria plays a major role in the chemistry of supported metal nanoparticles. The nanostructure, redox properties and oxygen storage capacity of ceria can affect the morphology, structure, as well as catalytic reactivity of supported metal nanoparticles. The addition of other metal elements such as Ti can result in structural and electronic modifications of ceria, which not only can enhance the thermal stability of ceria, but also improve its redox properties and oxygen storage capacity. In this paper, we discuss the effect of Ti dopant in the ceria support on the structure of metal particles at the fundamental level. Ti-doped CeOx(111) thin films were prepared on Ru(0001) as model supports under ultrahigh vacuum conditions. Their structures were examined in detail by LEED, XPS and STM. The nucleation and growth of metal particles including Au and Ni on the doped-ceria surfaces were investigated upon deposition at 300 K as well as after heating to higher temperatures, which is compared to that on the pure ceria supports. The research is sponsored by University of Wyoming start-up fund and Wyoming NASA Space grant.