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Surface Functionalization of Nanostructured Fe2O3 Polymorphs: From Design to Light-Activated Applications (Articolo in rivista)

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Surface Functionalization of Nanostructured Fe2O3 Polymorphs: From Design to Light-Activated Applications (Articolo in rivista) (literal)

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Barreca D.; Carraro G.; Gasparotto A.; MacCato C.; Rossi F.; Salviati G.; Tallarida M.; Das C.; Fresno F.; Korte D.; Stangar U.L.; Franko M.; Schmeisser D. (2013)
Surface Functionalization of Nanostructured Fe2O3 Polymorphs: From Design to Light-Activated Applications
in ACS applied materials & interfaces (Print); American Chemical Society, Washington, DC (Stati Uniti d'America)
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Barreca D.; Carraro G.; Gasparotto A.; MacCato C.; Rossi F.; Salviati G.; Tallarida M.; Das C.; Fresno F.; Korte D.; Stangar U.L.; Franko M.; Schmeisser D. (literal)

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1 : IENI-CNR and INSTM, Department of Chemistry, Padova University, Via Marzolo 1, 35131 Padova, Italy / 2,3,4 : Department of Chemistry, Padova University, INSTM, Via Marzolo 1, 35131 Padova, Italy / 5,6 : IMEM-CNR, Parco Area delle Scienze 37/A, 43124 Parma, Italy / 7,8,13 : Brandenburg University of Technology, Konrad Wachsmann Allee 17, 03046 Cottbus, Germany / 9,10,11,12 : Laboratory for Environmental Research, Nova Gorica University, Vipavska 13, 5001 Nova Gorica, Slovenia (literal)

Titolo

Surface Functionalization of Nanostructured Fe2O3 Polymorphs: From Design to Light-Activated Applications (literal)

Abstract

Nanostructured iron(III) oxide deposits are grown by chemical vapor deposition (CVD) at 400-500 °C on Si(100) substrates from Fe(hfa)2TMEDA (hfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedionate; TMEDA = N,N,N',N'-tetramethylethylenediamine), yielding the selective formation of ?-Fe2O3 or the scarcely studied ?-Fe2O3 polymorphs under suitably optimized preparative conditions. By using Ti(OPr(i))4 (OPr(i) = iso-propoxy) and water as atomic layer deposition (ALD) precursors, we subsequently functionalized the obtained materials at moderate temperatures (<300 °C) by an ultrathin titanomagnetite (Fe3-xTixO4) overlayer. An extensive multitechnique characterization, aimed at elucidating the system structure, morphology, composition and optical properties, evidenced that the photoactivated hydrophilic and photocatalytic behavior of the synthesized materials is dependent both on iron oxide phase composition and ALD surface modification. The proposed CVD/ALD hybrid synthetic approach candidates itself as a powerful tool for a variety of applications where semiconductor-based nanoarchitectures can benefit from the coupling with an ad hoc surface layer. (literal)

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