Stability and Exfoliation of Germanane: A Germanium Graphane Analogue

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• 作者：Elisabeth Bianco ; Sheneve Butler ; Shishi Jiang ; Oscar D. Restrepo ; Wolfgang Windl ; Joshua E. Goldberger
• 刊名：ACS Nano
• 出版年：2013
• 出版时间：May 28, 2013
• 年：2013
• 卷：7
• 期：5
• 页码：4414-4421
• 全文大小：495K
• 年卷期：v.7,no.5(May 28, 2013)
• ISSN：1936-086X

文摘

Graphene鈥檚 success has shown not only that it is possible to create stable, single-atom-thick sheets from a crystalline solid but that these materials have fundamentally different properties than the parent material. We have synthesized for the first time, millimeter-scale crystals of a hydrogen-terminated germanium multilayered graphane analogue (germanane, GeH) from the topochemical deintercalation of CaGe₂. This layered van der Waals solid is analogous to multilayered graphane (CH). The surface layer of GeH only slowly oxidizes in air over the span of 5 months, while the underlying layers are resilient to oxidation based on X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy measurements. The GeH is thermally stable up to 75 掳C; however, above this temperature amorphization and dehydrogenation begin to occur. These sheets can be mechanically exfoliated as single and few layers onto SiO₂/Si surfaces. This material represents a new class of covalently terminated graphane analogues and has great potential for a wide range of optoelectronic and sensing applications, especially since theory predicts a direct band gap of 1.53 eV and an electron mobility ca. five times higher than that of bulk Ge.

Keywords:

2D materials; graphene analogues; layered materials; germanium; germanane; hydrogenated germanene