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  Template-free synthesis of novel, highly-ordered 3D hierarchical Nb3O7(OH) superstructures with semiconductive and photoactive properties

Betzler, S. B., Wisnet, A., Breitbach, B., Mitterbauer, C., Weickert, J., Schmidt-Mende, L., et al. (2014). Template-free synthesis of novel, highly-ordered 3D hierarchical Nb3O7(OH) superstructures with semiconductive and photoactive properties. Journal of Materials Chemistry A, 2(30), 12005-12013. doi:10.1039/c4ta02202e.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-B65B-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6D60-9
Genre: Journal Article

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 Creators:
Betzler, Sophia B.1, Author              
Wisnet, Andreas2, Author              
Breitbach, Benjamin3, Author              
Mitterbauer, Christoph4, Author              
Weickert, Jonas5, Author              
Schmidt-Mende, Lukas5, Author              
Scheu, Christina2, 6, Author              
Affiliations:
1Department of Chemistry, Center for Nanoscience, Ludwig-Maximilians-University, 81377 Munich, Germany , ou_persistent22              
2Department of Chemistry, Ludwig-Maximilians-Universität and Center for NanoScience (CeNS), Butenandtstraße 11, 81377 Munich, Germany, ou_persistent22              
3Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863398              
4FEI Company, Achtseweg Noord 5, 5600 KA Eindhoven, The Netherlands, ou_persistent22              
5Department of Physics, University of Konstanz, Universitätsstraße 10, 78464 Konstanz, Germany, ou_persistent22              
6Nanoanalytics and Interfaces, Independent Max Planck Research Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_2054294              

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Free keywords: Electron energy loss spectroscopy; Nanowires; Scanning electron microscopy; Transmission electron microscopy; Electrode material; Formation mechanism; Large surface area; Nanowire junctions; Photoactive properties; Photocatalytic activities; Self-organized formation; Transmission electron
 Abstract: 3D hierarchical Nb3O7(OH) mesocrystals can be formed by self-organization from nanometer sized building blocks. The present study focuses on the synthesis and detailed investigation of mesocrystals, which can be achieved from a one-step, template-free hydrothermal synthesis approach. The obtained cubic superstructures consist of a periodic nanowire-network and combine a large surface area, high crystallinity, with a band gap of 3.2 eV and photocatalytic activity. Their easy processability in combination with the named excellent properties makes them promising candidates for a large number of applications. These include photochemical and photophysical devices where the Nb3O7(OH) mesocrystals can be used as electrode material since they are semiconducting and possess a large surface area. Generally the forces involved in the self-organized formation of mesocrystals are not fully understood. In this regard, the assembly of the Nb3O7(OH) mesocrystals was investigated in-depth applying transmission electron microscopy, scanning electron microscopy. UV/Vis measurements and electron energy-loss spectroscopy. Based on the achieved results a formation mechanisms is proposed, which expands the number of mechanisms for mesocrystal formation reported in literature. In addition, our study reveals different types of nanowire junctions and investigates their role at the stabilization of the networks.

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Language(s): eng - English
 Dates: 2014-08-14
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000339535100059
DOI: 10.1039/c4ta02202e
 Degree: -

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Title: Journal of Materials Chemistry A
  Abbreviation : J. Mater. Chem. A
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 2 (30) Sequence Number: - Start / End Page: 12005 - 12013 Identifier: ISSN: 2050-7488
CoNE: /journals/resource/2050-7488