Formation of TiO2 nanoparticles by reactive-layer-assisted deposition and characterization by XPS and STM.
Stoichiometric TiO2 nanoparticles (1-5 nm) were prepared by reactive-layer-assisted deposition (RLAD), in which Ti was initially deposited on a multilayer of H2O (or NO2) on a Au(111) substrate at approximately 90 K. The composition and atom-resolved structure of the nanoparticles were studied by XPS and STM. The approximately 5 nm TiO2 particles had either a rutile or anatase phase with various crystal facets. STS of the nanoparticles suggests size-dependent electronic structure. These well-defined nanoparticles can be used in molecular-level studies of the reactions and mechanisms of photocatalytic processes on TiO2 nanoparticle surfaces.
Song
Zhen
Z
Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA.
Hrbek
Jan
J
Osgood
Richard
R
D003460:Crystallization / Q000379:methods*; D006358:Hot Temperature; D008422:Materials Testing; D008567:Membranes, Artificial; D017348:Microscopy, Electron, Scanning Transmission; D008968:Molecular Conformation; D043942:Nanotubes / Q000032:analysis / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013052:Spectrometry, X-Ray Emission; D014025:Titanium / Q000032:analysis / Q000737:chemistry*
D008567:Membranes, Artificial; C009495:titanium dioxide; D014025:Titanium