| AVS 54th International Symposium | |
| Surface Science | Tuesday Sessions |
| Session SS-TuP |
| Session: | Surface Science Poster Session |
| Presenter: | Y.Z. Le, Columbia University |
| Authors: | Y.Z. Le, Columbia University N. Stojilovic, Columbia University R.M. Osgood, Columbia University J. Hrbek, Brookhaven National Laboratory |
| Correspondent: | Click to Email |
Titania (TiO2) nanoparticles are formed on Au(111) surfaces under ultrahigh vacuum conditions using the method of reactive-layer-assisted deposition (RLAD). In this method, physical-vapor deposited Ti on H2O/Au(111) reacts with oxygen from water to produce TiO2 nanoparticles. During heating of the substrate unreacted water molecules and its fragments desorb leaving the TiO2 nanoparticles on Au(111) surfaces. Characterization of the nanoparticles is performed using Auger electron spectroscopy (AES) whereas temperature programmed desorption (TPD) experiments are used to probe the surface chemistry of water and halogenated alkanes on these nanoparticles. Effect of titania coverage and particle size on subsequent desorption kinetics and surface chemistry is investigated. In particular, we have probed the reactive formation of these particles as a function of surface annealing temperature and observed changes in desorbed species. This formation chemistry is aided by a separate scanning tunneling microscopy (STM) study of the particle morphology, which reveals nanoparticles of 1-5 nm in size.