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Bioinspired Nanodevice Based on the Folic Acid/Titanium Dioxide System
Authors:Sylwia Gawęda  Grażyna Stochel Prof Dr  Konrad Szaciłowski Dr
Institution:Centrum Nanochemii Nieorganicznej, Wydzia? Chemii, Uniwersytet Jagielloński ul. Romana Ingardena 3, 30‐060 Kraków, Poland, Fax: (+48)?12‐634‐0515
Abstract:A new bioinspired nanomaterial has been obtained by chemisorption of folic acid onto nanocrystalline titanium dioxide. The organic chromophore is linked with the semiconductor surface via the glutamate chain and anchored with the carboxylate group. The geometry and electronic structure of the chromophore was studied in detail with DFT. Photoelectrochemical studies revealed photosensitization of the new material towards visible light. The photoelectrodes composed of the folic acid/titanium dioxide hybrid material generated photocurrent over a 300–600‐nm window. Moreover, the direction of the photocurrent could be changed from anodic to cathodic and vice versa by application of the appropriate photoelectrode potential. Photoelectrochemical and spectroscopic studies allowed the elucidation of the mechanism of photocurrent switching. Photoelectrodes composed of folate‐modified titanium dioxide may serve as a simple model of optoelectronic switches and may constitute the basis for molecular photoelectronic devices.
Keywords:folic acid  molecular devices  photochemistry  photosensitizer  titanium
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