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arXiv · 2010.03786

The Lightest 2D Nanomaterial: Freestanding Ultrathin Li Nanosheets by in-situ Electron Microscopy

Muhua Sun·Nore Stolte·Jianlin Wang·Jiake Wei·Pan Chen·Yu Zhao·Zhi Xu·Wenlong Wang·Ding Pan·Xuedong Bai
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Abstract

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.

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Muhua Sun, Nore Stolte, Jianlin Wang, Jiake Wei, Pan Chen, Yu Zhao, Zhi Xu, Wenlong Wang, Ding Pan, Xuedong Bai. 2020-10-08. The Lightest 2D Nanomaterial: Freestanding Ultrathin Li Nanosheets by in-situ Electron Microscopy. https://arxiv.org/abs/2010.03786

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