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Photosensitization and the Photocurrent Switching Effect in Nanocrystalline Titanium Dioxide Functionalized with Iron(II) Complexes: A Comparative Study
Author(s) -
Macyk Wojciech,
Stochel Grażyna,
Szaciłowski Konrad
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700226
Subject(s) - photocurrent , titanium dioxide , nanocrystalline material , materials science , ferrocene , irradiation , electrode , photochemistry , photoelectrochemical cell , photoelectrochemistry , chemistry , optoelectronics , nanotechnology , electrochemistry , electrolyte , physics , nuclear physics , metallurgy
Selected iron(II) complexes (ferrocene, ferrocenylboronic acid, hexacyanoferrate(II)) have been used as photosensitizers of titanium dioxide. Various types of electronic interactions between the surface complex and the semiconducting support are reflected in different yields of photocurrent generated upon visible‐light irradiation and different efficiencies of the photosensitization effect. The studied systems, showing the photocurrent switching upon changes of electrode potential and energy of photons (the PEPS effect), are good models of simple photoelectrochemical logic devices. The mechanism of photosensitization and photocurrent switching is discussed with respect to the type of surface‐complex–support interaction. Quantum‐mechanical calculations support the proposed mechanisms.