Open AccessSURFACE CHARACTER OF TITANIA CHANGED BY EXCIMER LASER
Author(s) -
Xiaoming Wen,
Xie Chong-Wei,
Lin Li-zhong,
Cui Yongjie
Publication year - 1997
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.46.1652
Subject(s) - fluence , materials science , excimer laser , x ray photoelectron spectroscopy , irradiation , laser , stoichiometry , excimer , analytical chemistry (journal) , semiconductor , insulator (electricity) , optics , optoelectronics , chemistry , chemical engineering , organic chemistry , engineering , physics , chromatography , nuclear physics
The electric conductivity changes markedly when titania is irradited by a proper-fluence excimer laser, it changes from insulator to semiconductor at room temperature, and its color changes too. Several titania samples before and after irradiation are studied with XRD, XPS and microscopic analyses. It is observed that the changes takes place when proper-fluence excimer laser pulse irradites the surface of titania and the temperature of the surface rises quickly. A thin layer of the irradited area melts quickly and soon resolidifies. This leads oxygen in titania to vacate partly, so the stoichiometry of the sample deviates from the normal value. The laser fluence threshold is estimated by the equation of heat transfer and the result agrees approximately with the experiment.