Direct observation of suppressed recombination of electron-hole pairs in the TiO2 nanopowders with anatase-rutile interface: in-situ NEXAFS study under UV irradiation

Author

Park, Hoon ; Jie, Hyunseock ; Lee, Ho-bum ; Chae, Keun-Hwa ; Park, Jong-Ku ; Lee, Dok-Yol

Author_Institution

Korea Inst. of Sci. & Technol., Seoul

Volume

1

fYear

2006

fDate

22-25 Oct. 2006

Firstpage

686

Lastpage

689

Abstract

High-performance TiO₂ photocatalysts have been mainly issued in the area of photoactive materials for a long time. The role of anatase-rutile phase boundary on the photoactivity of TiO₂ could be demonstrated combining the materials data with NEXAFS results. An interface between anatase and rutile phases (phase boundary) was directly proved to trap the electrons excited from the valance band, for the first time, by in-situ NEXAFS study under UV light irradiation. Long-life electrons in the trap sites contributed to improve drastically the photocatalytic property of TiO₂ nanopowders made by chemical vapor synthesis.

Keywords

catalysis; catalysts; electron-hole recombination; nanoparticles; photochemistry; semiconductor materials; titanium compounds; ultraviolet radiation effects; valence bands; NEXAFS; TiO₂; TiO₂ - Binary; UV light irradiation; anatase-rutile interface; anatase-rutile phase boundary; chemical vapor synthesis; electron-hole pair recombination; nanopowders; photoactive materials; photocatalysts; trap sites; valance band; Charge carrier processes; Chemicals; Crystallization; Electron traps; Lamps; Nanoparticles; Photonic band gap; Radiative recombination; Spontaneous emission; X-ray scattering; NEXAFS; Photocatalyst; TiO2; UV; e-h recombination;

fLanguage

English

Publisher

ieee

Conference_Titel

Nanotechnology Materials and Devices Conference, 2006. NMDC 2006. IEEE

Conference_Location

Gyeongju

Print_ISBN

978-1-4244-0541-1

Electronic_ISBN

978-1-4244-0541-1

Type

conf

DOI

10.1109/NMDC.2006.4388962

Filename

4388962