论文标题
最轻的2D纳米材料：由原位电子显微镜进行独立的超薄li纳米片
The Lightest 2D Nanomaterial: Freestanding Ultrathin Li Nanosheets by in-situ Electron Microscopy
论文作者
论文摘要
锂（Li）是最简单的金属和最轻的固体元素。在这里，我们报告了二维（2D）超薄li纳米片的首次演示，其横向尺寸较大，最高几百个纳米，而厚度仅限于几纳米，仅限几纳米，仅通过原位传输电子显微镜（TEM）。实时TEM成像结合了密度功能理论（DFT）的计算，纳米片增长的纳米级动力学被揭示了，这表明BCC结构LI到2D纳米片的生长是由于O2（111）表面的优先氧化而在O2（O2）中介导的动力学控制的结果。通过在TEM内配备的阴极发光（CL）光谱探测出生长的Li纳米片的等离子光学特性，并观察到可见的宽带可见发射包含平面内和不平面等离子体等离子体的贡献。
Lithium (Li) is the simplest metal and the lightest solid element. Here we report the first demonstration of controlled growth of two-dimensional (2D) ultrathin Li nanosheets with large lateral dimensions up to several hundreds of nanometres and thickness limited to just a few nanometres by in-situ transmission electron microscopy (TEM). The nanoscale dynamics of nanosheets growth were unravelled by real-time TEM imaging, which, in combination with density function theory (DFT) calculations indicates that the growth of bcc structured Li into 2D nanosheets is a consequence of kinetic control as mediated by preferential oxidization of the (111) surfaces due to the trace amount of O2 (~10-6 Pa) within TEM chamber. The plasmonic optical properties of the as-grown Li nanosheets were probed by cathodoluminescence (CL) spectroscopy equipped within TEM, and a broadband visible emission was observed that contains contributions of both in-plane and out-of-plane plasmon resonance modes.
