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

• Published in: Nano research 2018-03, Vol.11 (3), p.1714-1721
• Main Authors: Li, Chao, Lu, Xiuli, Han, Yingying, Tang, Shangfeng, Ding, Yi, Liu, Ruirui, Bao, Haihong, Li, Yuliang, Luo, Jun, Lu, Tongbu
• Format: Article
• Language: English
• Subjects: Atomic/Molecular Structure and Spectra; Biomedicine; Biotechnology; Chemistry and Materials Science; Condensed Matter Physics; Crystal structure; Electron beams; Electron diffraction; Electron energy; Electrons; Irradiation; Materials Science; Nanostructure; Nanotechnology; Radiation; Research Article; Spectroscopy; Thickness; Transmission electron microscopy; 水晶结构; 直接成像; 电子显微镜; 高分辨率; 联合使用; 电子衍射; 低电压; TEM
• ISSN: 1998-0124; 1998-0000
• DOI: 10.1007/s12274-017-1789-7

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.