Influence of adsorbed water and oxygen on the photoluminescence and EPR of Por-TiO2 (anatase)

被引：26

作者：

Konstantinova, E ^{[1
]}

Weidmann, J

Dittrich, T

机构：

[1] Tech Univ Munich, Dept Phys E16, D-85748 Garching, Germany

[2] INAP GmbH, D-45886 Gelsenkirchen, Germany

[3] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119899, Russia

来源：

JOURNAL OF POROUS MATERIALS | 2000年 / 7卷 / 1-3期

关键词：

porous TiO2; photoluminescence; EPR; adsorption of molecules;

D O I：

10.1023/A:1009699324013

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The influence of adsorbed water, oxygen, air and vacuum on the photoluminescence (PL) and electron paramagnetic resonance (EPR) has been investigated in situ and quasi in situ for por-TiO2 (anatase). The broad PL signal in the visible spectral region decreases with increasing partial pressure of oxygen and vanishes at pressures higher than 1 mbar. Adsorption of water leads (i) to a fast quenching and (ii) to a subsequent increase of the PL signal. The concentration of the O-2(-), O-, O-3(-) anion-radicals depends sensitively on the surface conditioning and on the illumination of the por-TiO2. Ti3+ centers could be observed only in vacuum treated samples. The concentrations of the Ti-3+ and oxygen anion radicals are in the range of 10(15) and 10(17) cm(-3), respectively.

引用

页码：389 / 392

页数：4

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