Photoinitiated charge separation in a hybrid titanium dioxide metalloporphyrin peptide material

H. Christopher Fry (), Yuzi Liu, Nada M. Dimitrijevic and Tijana Rajh
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H. Christopher Fry: Argonne National Laboratory, Center for Nanoscale Materials
Yuzi Liu: Argonne National Laboratory, Center for Nanoscale Materials
Nada M. Dimitrijevic: Argonne National Laboratory, Center for Nanoscale Materials
Tijana Rajh: Argonne National Laboratory, Center for Nanoscale Materials

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract In natural systems, electron flow is mediated by proteins that spatially organize donor and acceptor molecules with great precision. Achieving this guided, directional flow of information is a desirable feature in photovoltaic media. Here, we design self-assembled peptide materials that organize multiple electronic components capable of performing photoinduced charge separation. Two peptides, c16-AHL3K3-CO2H and c16-AHL3K9-CO2H, self-assemble into fibres and provide a scaffold capable of binding a metalloporphyrin via histidine axial ligation and mineralize titanium dioxide (TiO2) on the lysine-rich surface of the resulting fibrous structures. Electron paramagnetic resonance studies of this self-assembled material under continuous light excitation demonstrate charge separation induced by excitation of the metalloporphyrin and mediated by the peptide assembly structure. This approach to dye-sensitized semiconducting materials offers a means to spatially control the dye molecule with respect to the semiconducting material through careful, strategic peptide design.

Date: 2014
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DOI: 10.1038/ncomms5606

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