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Issue 20, 2016
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Thermal exfoliation of stoichiometric single-layer silica from the stishovite phase: insight from first-principles calculations

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Abstract

Mechanical cleavage, chemical intercalation and chemical vapor deposition are the main methods that are currently used to synthesize nanosheets or monolayers. Here, we propose a new strategy, thermal exfoliation for the fabrication of silica monolayers. Using a variety of state-of-the-art theoretical calculations we show that a stoichiometric single-layer silica with a tetragonal lattice, T-silica, can be thermally exfoliated from the stishovite phase in a clean environment at room temperature. The resulting single-layer silica is dynamically, thermally, and mechanically stable with exceptional properties, including a large band gap of 7.2 eV, an unusual negative Poisson's ratio, a giant Stark effect, and a high breakdown voltage. Moreover, other analogous structures like single-layer GeO2 can also be obtained by thermal exfoliation of its bulk phase. Our findings are expected to motivate experimental efforts on developing new techniques for the synthesis of monolayer materials.

Graphical abstract: Thermal exfoliation of stoichiometric single-layer silica from the stishovite phase: insight from first-principles calculations

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Publication details

The article was received on 01 Oct 2015, accepted on 17 Dec 2015 and first published on 22 Dec 2015


Article type: Paper
DOI: 10.1039/C5NR06788J
Citation: Nanoscale, 2016,8, 10598-10606

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    Thermal exfoliation of stoichiometric single-layer silica from the stishovite phase: insight from first-principles calculations

    Y. Guo, S. Zhang, T. Zhao and Q. Wang, Nanoscale, 2016, 8, 10598
    DOI: 10.1039/C5NR06788J

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