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Molecular Scale Photodiode Composed of Recombinant Ferredoxin/Chlorophyll a Heterostructure

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Photoelectrical rectifying property of biomolecular heterostructures is investigated in molecular scale. Recombinant ferredoxin and chlorophyll a were used as an electron acceptor and a sensitizer respectively in the molecular layer by mimicking photosynthesis. A self-assembled monolayer of recombinant ferredoxin was formed on Au surface, and then chlorophyll a was deposited onto the recombinant ferredoxin layer by Langmuir-Blodgett method. The formation of recombinant ferredoxin/chlorophyll a hetero-layers was confirmed by the SPR (surface plasmon resonance) spectroscopy, and the surface was observed by the STM (scanning tunneling microscopy). The rectifying property by the STS (scanning-tunneling-spectroscopy) based current–voltage characteristics was achieved in the recombinant ferredoxin/chlorophyll a hetero-layers. Thus, proposed hetero-layers functioned as a rectifier that can be useful property for the development of molecular-scale bioelectronic devices.
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Document Type: Research Article

Publication date: 01 September 2008

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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