http://www.cnr.it/ontology/cnr/individuo/prodotto/ID218938

Study of the Anchoring Process of Tethered Unsymmetrical Zn-Phthalocyanines on TiO2 Nanostructured Thin Films (Articolo in rivista)

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Study of the Anchoring Process of Tethered Unsymmetrical Zn-Phthalocyanines on TiO2 Nanostructured Thin Films (Articolo in rivista) (literal)

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Giovanna Pellegrino, Alessandra Alberti, Guglielmo G. Condorelli, Filippo Giannazzo, Antonino La Magna, Anna Maria Paoletti, Giovanna Pennesi, Gentilina Rossi, Gloria Zanotti (2013)
Study of the Anchoring Process of Tethered Unsymmetrical Zn-Phthalocyanines on TiO2 Nanostructured Thin Films
in Journal of physical chemistry. C. (Online); American Chemical Society, Washington (Stati Uniti d'America)
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Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Giovanna Pellegrino, Alessandra Alberti, Guglielmo G. Condorelli, Filippo Giannazzo, Antonino La Magna, Anna Maria Paoletti, Giovanna Pennesi, Gentilina Rossi, Gloria Zanotti (literal)

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CNR-IMM, Zona Industriale, VIII Strada, 5 95121 Catania, Italy Università degli Studi di Catania and INSTM UdR of Catania Viale, Andrea Doria, 6-95125 Catania, Italy CNR-ISM, Via Salaria Km. 29.5, 00015 Monterotondo--Stazione, Roma, Italy (literal)

Titolo

Study of the Anchoring Process of Tethered Unsymmetrical Zn-Phthalocyanines on TiO2 Nanostructured Thin Films (literal)

Abstract

Thin nanoporous TiO2 layers, deposited by dc reactive sputtering, have been functionalized with a novel unsymmetrical Zn(II) phthalocyanine (ZnPc-II) bearing a push-pull system, properly designed for application in dye sensitized solar cells. The anchoring process has been studied by combining visible absorption (vis), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) in order to investigate the molecular assembly during the early stage of the sensitizing process. The vis and XPS measurements indicate that the ZnPc-II surface density (dsurf, molecules/cm2) and its binding geometry are strongly affected by the concentration of the grafting solutions. It has been observed that the ZnPc-II surface density monotonically increases by increasing the solution concentration up to a saturation of dsurf 1.0 × 1013 molecules/cm2. Angle resolved XPS analyses indicate that at low molecular surface density a strong interaction between the ZnPc-II aromatic macrocycle and the TiO2 surface occurs, suggesting a planar binding geometry. The increase of the molecular surface density is accompanied by a mitigation of the surface-molecule interaction that leads to a different ZnPc-II binding geometry. Conductive atomic force microscopy has demonstrated that the charge transport through the dye-TiO2 interface strongly depends on the binding arrangements which exhibit different threshold values in the local I-V characteristics. (literal)

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