title: Mobility enhanced photoactivity in sol-gel grown epitaxial anatase TiO2 films.
abstract: Epitaxial anatase thin films were grown on single-crystal LaAlO3 substrates by a sol-gel process. The epitaxial relationship between TiO2 and LaAlO3 was found to be [100]TiO2||[100]LaAlO3 and (001)TiO2||(001)LaAlO3 based on X-ray diffraction and a high-resolution transmission electron microscopy. The epitaxial anatase films show significantly improved photocatalytic properties, compared with polycrystalline anatase film on fused silica substrate. The increase in the photocatalytic activity of epitaxial anatase films is explained by enhanced charge carrier mobility, which is traced to the decreased grain boundary density in the epitaxial anatase film.
authors.affiliation: School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea.
authors.forename: Hyun Suk
authors.initials: HS
authors.lastname: Jung
authors.forename: Jung-Kun
authors.initials: JK
authors.lastname: Lee
authors.forename: Jaegab
authors.initials: J
authors.lastname: Lee
authors.forename: Bo Soo
authors.initials: BS
authors.lastname: Kang
authors.forename: Quanxi
authors.initials: Q
authors.lastname: Jia
authors.forename: Michael
authors.initials: M
authors.lastname: Nastasi
authors.forename: Jun Hong
authors.initials: JH
authors.lastname: Noh
authors.forename: Chin-Moo
authors.initials: CM
authors.lastname: Cho
authors.forename: Sung Hoon
authors.initials: SH
authors.lastname: Yoon
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry*; D005782:Gels / Q000737:chemistry; D007811:Lanthanum / Q000737:chemistry*; D008567:Membranes, Artificial; D010087:Oxides / Q000737:chemistry*; D010777:Photochemistry; D013499:Surface Properties; D014025:Titanium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D017607:Aluminum Compounds; D005782:Gels; D008567:Membranes, Artificial; D010087:Oxides; C009495:titanium dioxide; D007811:Lanthanum; D014025:Titanium