Journalartikel

Jahr der Veröffentlichung: 2011

Seiten: 414-424

Zeitschrift: Nano Research

Bandnummer: 4

Heftnummer: 4

ISSN: 1998-0124

eISSN: 1998-0000

DOI Link: https://doi.org/10.1007/s12274-011-0096-y

Verlag: Springer

Abstract: 
Herein is reported the soft-templating synthesis of visible-light photoactive bismuth ferrite (BiFeO3) nanoarchitectures in the form of thin films using a poly(ethylene-co-butylene)-block-poly(ethylene oxide) diblock copolymer as the structure-directing agent. We establish that (1) the self-assembled materials employed in this work are highly crystalline after annealing at 550 A degrees C in air and that (2) neither the bismuth-poor Bi2Fe4O9 phase nor other impurity phases are formed. We further show that there is a distinct restructuring of the high quality cubic pore network of amorphous BiFeO3 during crystallization. This restructuring leads to films with a unique architecture that is composed of anisotropic crystallites intermingled with a continuous mesoporosity. While this article focuses on the characterization of these novel materials by electron microscopy, krypton physisorption, grazing incidence small-angle X-ray scattering, time-of-flight secondary ion mass spectrometry, X-ray photoelectron spectroscopy, UV-vis and Raman spectroscopy, we also examine the photocatalytic properties and show the benefits of the combination of mesoporosity and nanocrystallinity. Templated BiFeO3 thin films (25% porosity) with a direct optical band gap at 2.9 eV exhibit a catalytic activity for the degradation of rhodamine B much better than that of nontemplated samples. We attribute this improvement to the nanoscale porosity, which provides for more available active sites on the photocatalyst.

Harvard-Zitierstil: Reitz, C., Suchomski, C., Weidmann, C. and Brezesinski, T. (2011) Block copolymer-templated BiFeO₃ nanoarchitectures composed of phase-pure crystallites intermingled with a continuous mesoporosity: Effective visible-light photocatalysts?, Nano Research, 4(4), pp. 414-424. https://doi.org/10.1007/s12274-011-0096-y

APA-Zitierstil: Reitz, C., Suchomski, C., Weidmann, C., & Brezesinski, T. (2011). Block copolymer-templated BiFeO₃ nanoarchitectures composed of phase-pure crystallites intermingled with a continuous mesoporosity: Effective visible-light photocatalysts?. Nano Research. 4(4), 414-424. https://doi.org/10.1007/s12274-011-0096-y