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- W2011357360 abstract "Microwave conductivity and Raman spectroscopy were applied to study the influence of light and thermal annealing on porous TiO2 properties. Microwave absorption in porous TiO2 (anatase) showed an anomalous behaviour in the presence of light excitation (at 514 nm, i.e. below, or 356 nm, i.e. above the band gap). Exposure to light at a time scale of minutes reduces the microwave conductivity, in contrast to many bulk semiconductors excited above band gap. A reduced content of oxygen after heating in vacuum leads also to a reduction of microwave absorption. Both observations are in apparent contradiction with dc conductivity in TiO2. By comparison with light-induced EPR experiments, we conclude that the oxygen removal creates deep defects to which are transferred electrons previously trapped in shallow donors. As a consequence, this decreases the polarisability of TiO2 nanoparticles, the microwave absorption, and the dielectric constant." @default.
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- W2011357360 date "2000-11-01" @default.
- W2011357360 modified "2023-09-23" @default.
- W2011357360 title "Microwave Conductivity and Raman Spectroscopy of Porous TiO2" @default.
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- W2011357360 doi "https://doi.org/10.1002/1521-396x(200011)182:1<201::aid-pssa201>3.0.co;2-r" @default.
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