Determining the porphyrin shell of ZnO nanoparticles in situ
Dye sensitized solar cells are of high importance in solar cell research. The main functional part of them is a layer of semiconductor nanoparticles, which are covered with a dye. To obtain highly efficient cells the linkage between porphyrin and ZnO nanoparticles is of interest. We recently followed the stabilization of ZnO nanoparticles by the combination of in situ SAXS and SANS in dependence of time and temperature and in a further study we investigated the ligand exchange of the initially stabilizing acetate by simple catechol molecules. With this knowledge we want to analyze by the help of SANS (in combination with lab-SAXS) the exchange of acetate by different porphyrin dye molecules. Therefore, we intend to perform measurements of the starting ZnO solution, after absorption of different porphyrin concentrations and washed ZnO-porphyrin samples for two different porphyrins. For all samples the SLD of the solvent will be matched to the SLD of the ZnO core, so that the coherent signal will be originating only from the porphyrin shell. The in total 42 samples have to be measured for 1.5h each. Thus, we apply for three days of beamtime at the high-flux instrument D11.
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SCHINDLER Torben; HEPPT Jano; LINDNER Peter; NOLL Dennis; SCHMUTZLER Tilo and UNRUH Tobias. (2016). Determining the porphyrin shell of ZnO nanoparticles in situ. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-470
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