Cubes to Cubes: Organization of MgO Particles into One-Dimensional and Two-Dimensional Nanostructures.

Autor: Thomele D; Department of Chemistry and Physics of Materials, Paris-Lodron University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria.; Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany., Baumann SO; Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany., Schneider J; Department of Chemistry and Physics of Materials, Paris-Lodron University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria.; Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany., Sternig AK; Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 4, Erlangen, 91058, Germany., Shulda S; Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States., Richards RM; Department of Chemistry, Colorado School of Mines, Golden, Colorado 80401, United States., Schwab T; Department of Chemistry and Physics of Materials, Paris-Lodron University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria., Zickler GA; Department of Chemistry and Physics of Materials, Paris-Lodron University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria., Bourret GR; Department of Chemistry and Physics of Materials, Paris-Lodron University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria., Diwald O; Department of Chemistry and Physics of Materials, Paris-Lodron University Salzburg, Jakob Haringerstrasse 2a, Salzburg, 5020, Austria.
Jazyk: angličtina
Zdroj: Crystal growth & design [Cryst Growth Des] 2021 Aug 04; Vol. 21 (8), pp. 4674-4682. Date of Electronic Publication: 2021 Jul 02.
DOI: 10.1021/acs.cgd.1c00535
Abstrakt: Developing simple, inexpensive, and environmentally benign approaches to integrate morphologically well-defined nanoscale building blocks into larger high surface area materials is a key challenge in materials design and processing. In this work, we investigate the fundamental surface phenomena between MgO and water (both adsorption and desorption) with particles prepared via a vapor-phase process (MgO nanocubes) and a modified aerogel process (MgO(111) nanosheets). Through these studies, we unravel a strategy to assemble individual MgO nanoparticles into extended faceted single-crystalline MgO nanosheets and nanorods with well-defined exposed surfaces and edges. This reorganization can be triggered by the presence of H 2 O vapor or bulk liquid water. Water adsorption and the progressive conversion of vapor-phase grown oxide particles into hydroxides give rise to either one-dimensional or two-dimensional (1D or 2D) structures of high dispersion and surface area. The resulting Mg(OH) 2 lamella with a predominant (001) surface termination are well-suited precursor structures for their topotactic conversion into laterally extended and uniform MgO(111) grain surface configurations. To understand the potential of polar (111) surfaces for faceting and surface reconstruction effects associated with water desorption, we investigated the stability of MgO(111) nanosheets during vacuum annealing and electron beam exposure. The significant surface reconstruction of the MgO(111) surfaces observed shows that adsorbate-free (111)-terminated surfaces of unsupported MgO nanostructures reconstruct rather than remain as charged planes of either three-fold coordinated O 2- ion or Mg 2+ ions. Thus, here we demonstrate the role water can play in surface formation and reconstruction by bridging wet chemical and surface science inspired approaches.
Competing Interests: The authors declare no competing financial interest.
(© 2021 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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