Photosynthetic reaction centers/ITO hybrid nanostructure

Szabó, Tibor and Bencsik, Gábor and Magyar, Melinda and Visy, Csaba and Gingl, Zoltán and Nagy, Krisztina and Váró, György and Hajdu, Kata and Kozák, Gábor and Nagy, László (2013) Photosynthetic reaction centers/ITO hybrid nanostructure. MATERIALS SCIENCE AND ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS, 33 (2). pp. 769-774. ISSN 0928-4931

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Photosynthetic reaction center proteins purified from Rhodobacter sphaeroides purple bacteriumwere deposited on the surface of indium tin oxide (ITO), a transparent conductive oxide, and the photochemical/-physical properties of the composite were investigated. The kinetics of the light induced absorption change indicated that the RC was active in the composite and there was an interaction between the protein cofactors and the ITO. The electrochromic response of the bacteriopheophytine absorption at 771 nmshowed an increased electric field perturbation around this chromophore on the surface of ITOcompared to the onemeasured in solution. This absorption change is associated with the charge-compensating relaxation events inside the protein. Similar life time, but smaller magnitude of this absorption change was measured on the surface of borosilicate glass. The light induced change in the conductivity of the composite as a function of the concentration showed the typical sigmoid saturation characteristics unlike if the photochemically inactive chlorophyll was layered on the ITO. In this later case the light induced change in the conductivity was oppositely proportional to the chlorophyll concentration due to the thermal dissipation of the excitation energy. The sensitivity of the measurement is very high; few picomole RC can change the light induced resistance of the composite.

Item Type: Article
Uncontrolled Keywords: Conducting oxides Indium tin oxide Bio-nanocomposite Reaction center
Subjects: Q Science / természettudomány > Q1 Science (General) / természettudomány általában
Depositing User: Kata Berkes
Date Deposited: 26 Nov 2013 13:21
Last Modified: 26 Nov 2013 13:21

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