Title :
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
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;
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
DOI :
10.1109/NMDC.2006.4388962
