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  • Title: Photosensor based on an FET utilizing a biocomponent of photosystem I for use in imaging devices.
    Author: Terasaki N, Yamamoto N, Hattori M, Tanigaki N, Hiraga T, Ito K, Konno M, Iwai M, Inoue Y, Uno S, Nakazato K.
    Journal: Langmuir; 2009 Oct 06; 25(19):11969-74. PubMed ID: 19731941.
    Abstract:
    We have investigated a photosensor that consists of a field emission transistor (FET) utilizing the biocomponent of the photosystem I (PSI) protein complex for use in an imaging device. The PSI was immobilized on a gold electrode via the self-assembling monolayer (SAM) of 3-mercapto-1-propanesulfonic acid sodium salt to obtain a PSI-modified gold electrode. As for the PSI-modified gold electrode, the basic photoresponses originating from the excitation of PSI, including the photocurrent (106 nA) and the photoresponse of the open-circuit voltage (photo-Voc: 28.6 mV), were characterized. Then, the PSI-modified gold electrode was linked to the gate of the FET using a lead line, and the device was successfully driven by the photoelectric signals from the PSI like a voltage follower circuit. Further, we successfully demonstrated that the PSI-based FET acts as a photosensor in imaging devices.
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