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

作　　者：Chao Li Xiuli Lu Yingying Han Shangfeng Tang Yi Ding Ruirui Liu Haihong Bao Yuliang Li Jun Luo Tongbu Lu 

机构地区：[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

出　　处：《Nano Research》2018年第3期1714-1721,共8页纳米研究（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China （Nos. 11604241, 21790052 and 21331007）, the National Program for Thousand Young Talents of China, the Postdoctoral Science Foundation of China （No. 2015M580209）, the Tianjin Municipal Education Commission, the Tianjin Municipal Science and Technology Commission （No. 15JCYBJC52600）, and the Fundamental Research Fund of Tianjin University of Technology.

摘　　要：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.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.

关 键 词：few-layer graphdiyne crystal structure low-voltage transmissionelectron microscopy 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业] TS803[轻工技术与工程]