title: Rectified photocurrent of molecular photodiode consisting of cytochrome c/GFP hetero thin films.
abstract: Photoinduced electron transfer in the molecular electronic device consisting of protein-adsorbed hetero Langmuir-Blodgett (LB) film was investigated. Three kinds of functional molecules, cytochrome c, viologen, and green fluorescent protein (GFP) were used as an electron acceptor, a mediator, and a sensitizer, respectively. The hetero-LB film was fabricated by subsequently depositing cytochrome c and viologen onto the pretreated ITO or quartz glass. GFP adsorbed hetero-LB films were prepared by soaking the hetero-LB films into the buffer solution containing GFP. The MIM (metal/insulator/metal) structured molecular device was constructed by depositing aluminum onto the surface of the GFP-adsorbed hetero LB films. Due to the excitation by irradiation with a 460 nm monochromic light source, the photoinduced unidirectional flow of electrons in the MIM device could be achieved and was detected as photocurrents. The photoswitching function was achieved and the rectifying characteristic was observed in the molecular device. Based on the measurement of transient photocurrent of molecular device, the unidirectional flow of electrons was verified.
authors.affiliation: Department of Chemical Engineering, Sogang University, CPO Box 1142, Seoul 100-611, South Korea. jwchoi@ccs.sogang.ac.kr
authors.forename: J W
authors.initials: JW
authors.lastname: Choi
authors.forename: Y S
authors.initials: YS
authors.lastname: Nam
authors.forename: S J
authors.initials: SJ
authors.lastname: Park
authors.forename: W H
authors.initials: WH
authors.lastname: Lee
authors.forename: D
authors.initials: D
authors.lastname: Kim
authors.forename: M
authors.initials: M
authors.lastname: Fujihira
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D003574:Cytochrome c Group / Q000737:chemistry*; D004563:Electrochemistry; D004579:Electron Transport; D004582:Electronics, Medical / Q000295:instrumentation* / Q000379:methods; D049452:Green Fluorescent Proteins; D008164:Luminescent Proteins / Q000737:chemistry; D018625:Microscopy, Atomic Force; D010777:Photochemistry; D011993:Recombinant Fusion Proteins / Q000737:chemistry; D013053:Spectrophotometry; D013499:Surface Properties
chemical_list: D003574:Cytochrome c Group; D008164:Luminescent Proteins; D011993:Recombinant Fusion Proteins; D049452:Green Fluorescent Proteins