title: Heterogeneous reaction between Li and anatase TiO2 nanoparticles under ultra-high vacuum.
abstract: We demonstrate heterogeneous chemistry between Li and anatase TiO2 nanoparticles under UHV. The reduction of TiO2 upon formation of lithium oxide proceeds via two different schemes: one that reduces Ti(4+) to Ti(3+) and one that reduces Ti(4+) directly to Ti(2+). The second scheme sets in only after a critical degree of reduction (i.e. Li amount) has been reached (Li/Ti = 0.28) and is associated with restructuring of the film. Two films with different morphologies were compared and the results demonstrate that the reaction between Li and larger TiO2 structures (30-50 nm) is kinetically restricted while such effects were significantly less prominent for small particles (10 nm).
authors.affiliation: Dept. of Physics and Astronomy, Uppsala University, P. O. Box 516, SE-751 20 Uppsala, Sweden. anders.sandell@physics.uu.se
authors.forename: A
authors.initials: A
authors.lastname: Sandell
authors.forename: L E
authors.initials: LE
authors.lastname: Walle
authors.forename: J
authors.initials: J
authors.lastname: Blomquist
authors.forename: P
authors.initials: P
authors.lastname: Uvdal
authors.forename: A
authors.initials: A
authors.lastname: Borg