POTENTIAL MODULATED REFLECTANCE SPECTROSCOPY OF ANODIC OXIDE-FILMS ON TITANIUM

被引:20
作者
BLACKWOOD, DJ
PETER, LM
机构
[1] Department of Chemistry, University of Southampton, Southampton
关键词
D O I
10.1016/0013-4686(90)90045-2
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Potential modulated reflectance (PMR) spectroscopy has been used to investigate thin anodic oxide films formed on titanium in sulphuric acid. The origin of the reflectance modulation is discussed and the experimental results are compared with theoretical calculations based on the three layer model. The overall shape and the dependence of the PMR spectra on film thickness have been modelled satisfactorily by assuming that the band gap of the oxide in the presence of an electric field is increased due to dielectric polarisation. The potential dependence of the modulated reflectance response for films of constant thickness was related to the electric field distribution in the oxide and the analysis showed that the modulated reflectance response is dominated by electroabsorption. The results demonstrate that PMR spectroscopy offers a more reliable method than Mott-Schottky plots for determining the flat-band potential of the oxide. © 1990.
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页码:1073 / 1080
页数:8
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