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Yum, Jung Hwan
다차원 탄소재료 연구단
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Synthesis of Honeycomb-Structured Beryllium Oxide via Graphene Liquid Cells

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Title
Synthesis of Honeycomb-Structured Beryllium Oxide via Graphene Liquid Cells
Author(s)
Lifen Wang; Lei Liu; Ji Chen; Ali Mohsin; Jung Hwan Yum; Todd W. Hudnall; Christopher W. Bielawski; Tijana Rajh; Xuedong Bai; Shang-Peng Gao; Gong Gu
Subject
aqueous-solution synthesis, ; beryllium oxide, ; graphene liquid cells, ; high-resolution transmission electron microscopy, ; structural phase transition, ; thermodynamic ultra-thin limit
Publication Date
2020-09
Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, v.59, no.36, pp.15734 - 15740
Publisher
WILEY-V C H VERLAG GMBH
Abstract
© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Using high-resolution transmission electron microscopy and electron energy-loss spectroscopy, we show that beryllium oxide crystallizes in the planar hexagonal structure in a graphene liquid cell by a wet-chemistry approach. These liquid cells can feature van-der-Waals pressures up to 1 GPa, producing a miniaturized high-pressure container for the crystallization in solution. The thickness of as-received crystals is beyond the thermodynamic ultra-thin limit above which the wurtzite phase is energetically more favorable according to the theoretical prediction. The crystallization of the planar phase is ascribed to the near-free-standing condition afforded by the graphene surface. Our calculations show that the energy barrier of the phase transition is responsible for the observed thickness beyond the previously predicted limit. These findings open a new door for exploring aqueous-solution approaches of more metal-oxide semiconductors with exotic phase structures and properties in graphene-encapsulated confined cells
URI
https://pr.ibs.re.kr/handle/8788114/7664
DOI
10.1002/anie.202007244
ISSN
1433-7851
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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