Mobility enhanced photoactivity in sol-gel grown epitaxial anatase TiO2 films.
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.
Jung
Hyun Suk
HS
School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea.
Lee
Jung-Kun
JK
Lee
Jaegab
J
Kang
Bo Soo
BS
Jia
Quanxi
Q
Nastasi
Michael
M
Noh
Jun Hong
JH
Cho
Chin-Moo
CM
Yoon
Sung Hoon
SH
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
D017607:Aluminum Compounds; D005782:Gels; D008567:Membranes, Artificial; D010087:Oxides; C009495:titanium dioxide; D007811:Lanthanum; D014025:Titanium