title: Molecular scale photodiode composed of recombinant ferredoxin/chlorophyll a heterostructure.
abstract: 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.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Sogang University, 1 Shinsoo-dong, Mapo-gu, Seoul, 121-742, Korea.
authors.forename: Jeong-Woo
authors.initials: JW
authors.lastname: Choi
authors.forename: Doo-Bong
authors.initials: DB
authors.lastname: Lee
authors.forename: Byung-Keun
authors.initials: BK
authors.lastname: Oh
authors.forename: Junhong
authors.initials: J
authors.lastname: Min
authors.forename: Kun Soo
authors.initials: KS
authors.lastname: Kim
mesh_terms: D001703:Biophysics / Q000379:methods; D002734:Chlorophyll / Q000737:chemistry*; D000077194:Chlorophyll A; D004563:Electrochemistry / Q000379:methods; D004926:Escherichia coli / Q000378:metabolism; D005288:Ferredoxins / Q000737:chemistry*; D006046:Gold / Q000737:chemistry; D016252:Microscopy, Scanning Tunneling / Q000379:methods; D036103:Nanotechnology / Q000379:methods; D010788:Photosynthesis; D011994:Recombinant Proteins / Q000737:chemistry*; D012242:Rhodobacter sphaeroides / Q000378:metabolism; D018724:Spinacia oleracea / Q000378:metabolism; D020349:Surface Plasmon Resonance / Q000379:methods; D013499:Surface Properties
chemical_list: D005288:Ferredoxins; D011994:Recombinant Proteins; D002734:Chlorophyll; D006046:Gold; D000077194:Chlorophyll A