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arXiv 1502.02644cond-mat.mtrl-sci
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片状二维黑磷的原位热分解

In Situ Thermal Decomposition of Exfoliated Two-Dimensional Black Phosphorus

Xiaolong Liu, Joshua D. Wood, Kan-Sheng Chen, EunKyung Cho, Mark C. Hersam

摘要:

具有半导体带隙和高载流子迁移率的二维(2D)黑磷(BP)(通常称为磷烯)为下一代电子学和光电子学带来了重大希望。然而,作为2D材料,它具有比本体BP更高的表面积与体积比,这表明其化学和热稳定性将被修改。在此,进行原子尺度的显微镜和光谱研究来表征机械剥离的2D BP的热降解。从原位扫描/透射电子显微镜,观察到2D BP的分解在真空中在约400 °C下发生,与550 °C的本体BP升华温度相反。这种分解通过沿着[001]方向的眼状裂纹开始,然后继续,直到只剩下薄的、无定形的红色磷状骨架。原位电子能量损失谱、能量色散X射线谱和能量损失近边结构变化提供了对这种化学转化过程的定量了解。

英文摘要:

With a semiconducting band gap and high charge carrier mobility, two-dimensional (2D) black phosphorus (BP), often referred to as phosphorene, holds significant promise for next generation electronics and optoelectronics. However, as a 2D material, it possesses a higher surface area to volume ratio than bulk BP, suggesting that its chemical and thermal stability will be modified. Herein, an atomic-scale microscopic and spectroscopic study is performed to characterize the thermal degradation of mechanically exfoliated 2D BP. From in situ scanning/transmission electron microscopy, decomposition of 2D BP is observed to occur at ~400 °C in vacuum, in contrast to the 550 °C bulk BP sublimation temperature. This decomposition initiates via eye-shaped cracks along the [001] direction and then continues until only a thin, amorphous red phosphorous like skeleton remains. In situ electron energy loss spectroscopy, energy-dispersive X-ray spectroscopy, and energy-loss near-edge structure changes provide quantitative insight into this chemical transformation process.

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