Tuning electron transfer rates via systematic shifts in the acceptor state density using size-selected ZnO colloids
| Autor: | Raghu Chitta, Wayne L. Gladfelter, Andrew Bierbaum, David A. Blank, Adam S. Huss, Kent R. Mann, Darren J. Ceckanowicz |
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| Rok vydání: | 2010 |
| Předmět: |
Condensed Matter::Other
Chemistry Electron donor General Chemistry Edge (geometry) Photochemistry Biochemistry Acceptor Molecular physics Catalysis Condensed Matter::Materials Science Colloid chemistry.chemical_compound Electron transfer Colloid and Surface Chemistry Quantum dot Excited state Physics::Atomic and Molecular Clusters Density of states Physics::Chemical Physics |
| Zdroj: | Journal of the American Chemical Society. 132(40) |
| ISSN: | 1520-5126 |
| Popis: | We report direct measurements of the influence of the available density of acceptor states on the rate of near-barrierless electron transfer between a dye sensitizer and an oxide semiconductor. The electron donor was the excited state of a zinc porphyrin, and the acceptors were a series of size-selected ZnO nanocrystals. The available density of states was tuned by controlling the relative position of the ZnO band edge using quantum confinement. The resulting change in the rate was consistent with a simple model of the state density as a function of energy above the ZnO band edge. |
| Databáze: | OpenAIRE |
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