Mar 22, 2016
New redox photocatalysts based on Quantum Dots
Contact : Vincent Maurel

The recent work performed by a team of INAC researchers could widen the range of photocatalysts for chemical synthesis. This work evidenced the efficiency of core-shell CdSe-ZnS quantum dots as redox photocatalysts. These nanocrystals can be activated by visible light in water solution. Another promising feature evidenced by this work: they can bring more than one electron to each reactant and so catalyze complex oxido-reduction reactions.

These new photocatalysts were investigated by monitoring the 2 electrons oxidation reaction of 8-oxo-2′-deoxyguanosine and the 6 electrons reduction of nitrophenylalanine derivatives. The detection of reaction intermediates and the identification and quantitation of reaction products establish that both reactions are photocatalyzed simultaneously by CdSe-ZnS quantum dots. The photocatalyzed reactions are observed without the need for sacrificial reactants and with high turnover numbers (>400). These results demonstrate that CdSe-ZnS quantum dots can work efficiently as redox photocatalysts in water solution. The future work of our team will aim to use the energy levels tenability of these nanocrystals to explore a large variety of catalytic reactions and provide a true alternative to the iridium and ruthenium based photocatalysts that are most common up to now in photocatalysis for chemical synthesis.

Reference : Journal of Physical Chemistry C 2015, 119, 17857-17866.

http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.5b04396

 

Last update : 03/23 2016 (1163)

 

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