Stability and Exfoliation of Germanane: A Germanium Graphane Analogue
Stability and Exfoliation of Germanane: A Germanium Graphane Analogue
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DOI：
10.1021/nn4009406
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发表时间：
2013-05-01
期刊：
影响因子：
17.1
通讯作者：
Goldberger, Joshua E.
中科院分区：
文献类型：
--
作者：
Bianco, Elisabeth;Butler, Sheneve;Goldberger, Joshua E.
石墨烯的成功不仅表明可以从结晶固体中制造稳定的单原子厚度的片材，而且这些材料具有与母体材料根本不同的性质。我们已经合成的第一次，毫米级晶体的氢封端的锗多层石墨烷类似物（锗烷，GeH）从局部化学脱嵌的CaGe 2。这种层状货车范德华固体类似于多层石墨烷（CH）。GeH的表面层在空气中仅在5个月的时间内缓慢氧化，而下面的层基于X射线光电子能谱和傅里叶变换红外光谱测量对氧化具有弹性。GeH在高达75 ℃时是热稳定的;然而，在此温度以上，非晶化和脱氢开始发生。这些片可以作为单层或几层机械剥离到SiO2/Si表面上。这种材料代表了一类新的共价终止的石墨烷类似物，并具有广泛的光电和传感应用的巨大潜力，特别是因为理论预测的直接带隙为1.53 eV和电子迁移率为。比体锗高5倍。
Graphene's 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 degrees 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 as. five times higher than that of bulk Ge.