Photosynthetic reaction centers/ITO hybrid nanostructure

Tibor Szabó, Gábor Bencsik, Melinda Magyar, Csaba Visy, Zoltán Gingl, Krisztina Nagy, György Váró, Kata Hajdu, Gábor Kozák, László Nagy

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Photosynthetic reaction center proteins purified from Rhodobacter sphaeroides purple bacterium were 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 nm showed an increased electric field perturbation around this chromophore on the surface of ITO compared to the one measured 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.

Original languageEnglish
Pages (from-to)769-773
Number of pages5
JournalMaterials Science and Engineering C
Volume33
Issue number2
DOIs
Publication statusPublished - Mar 1 2013

Keywords

  • Bio-nanocomposite
  • Conducting oxides
  • Indium tin oxide
  • Reaction center

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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