A Decaheme Cytochrome as a Molecular Electron Conduit in Dye-Sensitized Photoanodes.

ABSTRACT: In nature, charge recombination in light-harvesting reaction centers is minimized by efficient charge separation. Here, it is aimed to mimic this by coupling dye-sensitized TiO₂ nanocrystals to a decaheme protein, MtrC from Shewanella oneidensis MR-1, where the 10 hemes of MtrC form a ≈7-nm-long molecular wire between the TiO₂ and the underlying electrode. The system is assembled by forming a densely packed MtrC film on an ultra-flat gold electrode, followed by the adsorption of approximately 7 nm TiO₂ nanocrystals that are modified with a phosphonated bipyridine Ru(II) dye (RuP). The step-by-step construction of the MtrC/TiO₂ system is monitored with (photo)electrochemistry, quartz-crystal microbalance with dissipation (QCM-D), and atomic

SUBMITTER: Hwang ET 

PROVIDER: S-EPMC4493899 | biostudies-literature | 2015 Apr

REPOSITORIES: biostudies-literature