title: Hollow Zn/Co Zeolitic Imidazolate Framework (ZIF) and Yolk-Shell Metal@Zn/Co ZIF Nanostructures.
abstract: Metal-organic frameworks (MOFs) feature a great possibility for a broad spectrum of applications. Hollow MOF structures with tunable porosity and multifunctionality at the nanoscale with beneficial properties are desired as hosts for catalytically active species. Herein, we demonstrate the formation of well-defined hollow Zn/Co-based zeolitic imidazolate frameworks (ZIFs) by use of epitaxial growth of Zn-MOF (ZIF-8) on preformed Co-MOF (ZIF-67) nanocrystals that involve in situ self-sacrifice/excavation of the Co-MOF. Moreover, any type of metal nanoparticles can be accommodated in Zn/Co-ZIF shells to generate yolk-shell metal@ZIF structures. Transmission electron microscopy and tomography studies revealed the inclusion of these nanoparticles within hollow Zn/Co-ZIF with dominance of the Zn-MOF as shell. Our findings lead to a generalization of such hollow systems that are working effectively to other types of ZIFs.
authors.affiliation: Chair of Inorganic Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Rösler
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
authors.forename: Arshad
authors.initials: A
authors.lastname: Aijaz
authors.affiliation: EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.
authors.forename: Stuart
authors.initials: S
authors.lastname: Turner
authors.affiliation: EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.
authors.forename: Maria
authors.initials: M
authors.lastname: Filippousi
authors.affiliation: Chair of Inorganic Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
authors.forename: Azar
authors.initials: A
authors.lastname: Shahabi
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstrasse 150, 44780, Bochum, Germany.
authors.forename: Wei
authors.initials: W
authors.lastname: Xia
authors.affiliation: EMAT, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium.
authors.forename: Gustaaf
authors.initials: G
authors.lastname: Van Tendeloo
authors.affiliation: Laboratory of Industrial Chemistry, Ruhr-University Bochum, Universitätsstrasse 150, 44780, Bochum, Germany. muhler@techem.rub.de.
authors.forename: Martin
authors.initials: M
authors.lastname: Muhler
authors.affiliation: Chair of Inorganic Chemistry II, Ruhr-University Bochum, Universitätsstrasse 150, 44780, Bochum, Germany. roland.fischer@rub.de.
authors.forename: Roland A
authors.initials: RA
authors.lastname: Fischer
keywords: metal-organic frameworks; nanoparticles; yolk-shell nanostructures; zeolites