Research Article


2018, 11(3): 1714–1721


Direct imaging and determination of the crystal structure of six-layered graphdiyne

Chao Li1,§, Xiuli Lu1,§, Yingying Han1, Shangfeng Tang1, Yi Ding1, Ruirui Liu1, Haihong Bao1, Yuliang Li2, Jun Luo1 (*), and Tongbu Lu1 (*)

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1 Center for Electron Microscopy, TUT-FEI Joint Laboratory, Tianjin Key Laboratory of Advanced Porous Functional Materials, Institute for New Energy Materials & Low-Carbon Technologies, School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
2 Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
§ Chao Li and Xiuli Lu contributed equally to this work.

Keywords: few-layer graphdiyne, crystal structure, low-voltage transmission electron microscopy
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ABSTRACT Since its discovery, the direct imaging and determination of the crystal structure of few-layer graphdiyne has proven difficult because it is too delicate under irradiation by an electron beam. In this work, the crystal structure of a six-layered graphdiyne nanosheet was directly observed by low-voltage transmission electron microscopy (TEM) using low current density. The combined use of high-resolution TEM (HRTEM) simulation, electron energy-loss spectroscopy, and electron diffraction revealed that the as-synthesized nanosheet was crystalline graphdiyne with a thickness of 2.19 nm (corresponding to a thickness of six layers) and showed ABC stacking. Thus, this work provides direct evidence for the existence and crystal structure of few-layer graphdiyne, which is a new type of two-dimensional carbon material complementary to graphene.
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Direct imaging and determination of the crystal structure of six-layered graphdiyne. Nano Res. 2018, 11(3): 1714–1721

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