Details
| Original language | English |
|---|---|
| Pages (from-to) | 777-782 |
| Number of pages | 6 |
| Journal | Physical Chemistry Chemical Physics |
| Volume | 8 |
| Issue number | 6 |
| Publication status | Published - 2006 |
Abstract
The electrical photoconductivity and conductivity at (and near) the surface of a TiO2 single crystal (rutile) was studied in a range of temperatures between 300 and 573 K and under different ambient gases (oxygen and nitrogen) by means of impedance spectroscopy. The long times required (many hours) to reach steady state photoconductivity can be explained by the reduction of the material upon illumination. At about 475 K a maximum is observed in the equilibrium photoconductivity and a minimum in the rate constants of the rise and decay after switching on and off, respectively, the light. After switching off the light a fast decay takes place during the first milliseconds followed by a slow exponential decay. The first one is related to recombination through defects, while the latter is due to re-oxidation processes of the material. The results are correlated with measurements of photocatalytic activity.
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In: Physical Chemistry Chemical Physics, Vol. 8, No. 6, 2006, p. 777-782.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Influence of gas atmosphere and temperature on the conductivity and the photoconductivity of a TiO2 single crystal in the surface region
AU - Amade, R.
AU - Heitjans, P.
AU - Indris, S.
AU - Finger, M.
AU - Haeger, A.
AU - Hesse, D.
PY - 2006
Y1 - 2006
N2 - The electrical photoconductivity and conductivity at (and near) the surface of a TiO2 single crystal (rutile) was studied in a range of temperatures between 300 and 573 K and under different ambient gases (oxygen and nitrogen) by means of impedance spectroscopy. The long times required (many hours) to reach steady state photoconductivity can be explained by the reduction of the material upon illumination. At about 475 K a maximum is observed in the equilibrium photoconductivity and a minimum in the rate constants of the rise and decay after switching on and off, respectively, the light. After switching off the light a fast decay takes place during the first milliseconds followed by a slow exponential decay. The first one is related to recombination through defects, while the latter is due to re-oxidation processes of the material. The results are correlated with measurements of photocatalytic activity.
AB - The electrical photoconductivity and conductivity at (and near) the surface of a TiO2 single crystal (rutile) was studied in a range of temperatures between 300 and 573 K and under different ambient gases (oxygen and nitrogen) by means of impedance spectroscopy. The long times required (many hours) to reach steady state photoconductivity can be explained by the reduction of the material upon illumination. At about 475 K a maximum is observed in the equilibrium photoconductivity and a minimum in the rate constants of the rise and decay after switching on and off, respectively, the light. After switching off the light a fast decay takes place during the first milliseconds followed by a slow exponential decay. The first one is related to recombination through defects, while the latter is due to re-oxidation processes of the material. The results are correlated with measurements of photocatalytic activity.
UR - http://www.scopus.com/inward/record.url?scp=33645450447&partnerID=8YFLogxK
U2 - 10.1039/b514867g
DO - 10.1039/b514867g
M3 - Article
C2 - 16482319
AN - SCOPUS:33645450447
VL - 8
SP - 777
EP - 782
JO - Physical Chemistry Chemical Physics
JF - Physical Chemistry Chemical Physics
SN - 1463-9076
IS - 6
ER -