title: A novel reaction model for the electrical conductivity of ultra-thin TiO2 films in H2.
abstract: Two ultra-thin TiO(2) films with platinum electrodes were prepared on a porous anodic aluminium oxide thick layer and a ceramic plate, respectively. It was found that in both TiO(2) films the conductance was almost proportional to the fourth root of the H(2) concentration in N(2) ambient at 500 °C. A quantitative model based on the spill-over mechanism is established to describe this novel correlation.
authors.affiliation: Department of Electrical and Computer Engineering, University of Kentucky, Lexington, KY 40506, USA. chi_lu_uky@yahoo.com
authors.forename: Chi
authors.initials: C
authors.lastname: Lu
authors.forename: Zhi
authors.initials: Z
authors.lastname: Chen
authors.forename: Ping
authors.initials: P
authors.lastname: Yu
mesh_terms: D000537:Aluminum Oxide; D004553:Electric Conductivity; D004566:Electrodes; D006859:Hydrogen / Q000737:chemistry*; D008958:Models, Molecular; D009584:Nitrogen / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D006859:Hydrogen; D014025:Titanium; D000537:Aluminum Oxide; D009584:Nitrogen