Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)

 

The critical role played by the catalytic moiety in the early-time photodynamics of hydrogen generating bimetallic photocatalysts

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Qing Pan, Francesco Mecozzi, Jeroen P. Korterik, Johannes G. Vos, Wesley R. Browne, Annemarie Huijser
ChemPhysChem
10.1002/cphc.201600458 accepted june 3, 2016
doi:10.1002/cphc.201600458

The effect of the catalytic moiety on the early-time photodynamics of Ru/M (M = Pt or Pd) bimetallic photocatalysts is studied by ultrafast transient absorption spectroscopy. In comparison to the Ru/Pd photocatalyst described earlier, the Ru/Pt analogue showed complex excited state dynamics with three distinct kinetic components ranging from sub-ps to 102 ps, requiring a more sophisticated photophysical model than that developed earlier forthe Ru/Pd complex. In the Pu/Pt complex an additional lower-lying excited state is proposed to quench the hot higher-lying tripletmetal-to-ligand charge transfer states. Furthermore, a strong excitation wavelength dependence on the population of excited states is observed for both the Ru/Pt and Ru/Pd complexes, indicating a non-equilibrated distribution even on the 102 ps timescale. These insights shed light on the significant impact of the catalytic moiety on the fundamental early-time photophysics of Ru-based photocatalysts.
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