| AVS 57th International Symposium & Exhibition | |
| Surface Science | Friday Sessions |
| Session SS-FrM |
| Session: | Reactivity of Oxides, Mainly TiO2 |
| Presenter: | H. Khosravian, University of Illinois at Chicago |
| Authors: | H. Khosravian, University of Illinois at Chicago Z. Liang, University of Illinois at Chicago A. Uhl, University of Illinois at Chicago R. Meyer, University of Illinois at Chicago M. Trenary, University of Illinois at Chicago |
| Correspondent: | Click to Email |
In this combined STM and DFT study, we examine the adsorption of Rh(CO)2(acac) (acac is acetylacetonate) on a TiO2(110) single crystal surface, which is aimed at developing an understanding of the relationship between the preferred adsorption sites of the supported organometallic species, and the nucleation behavior of this precursor compound on different surface terminations. The STM images of clean TiO2(110) show large terraces with the characteristic row pattern that arises from alternating lines of bridging oxygen and uncapped titanium ions. After exposing Rh(CO)2(acac) to the surface at room temperature the formation of small particles is observed, with diameters of 1 nm or less, and a height of 2.5 Å (i.e., monolayer height). After annealing the sample to 630˚C the density and number of the particles is significantly reduced. The particles appear to be monodispersed, with their sizes increased to several nm in lateral directions, and about 5 Å in height (i.e., bilayer height). The findings can be rationalized in terms of deligation of the parent species and agglomeration of the denuded rhodium. The details of the adsorption and deligation Process have been characterized with DFT calculations.