Enhanced exfoliation efficiency of graphite into few-layer graphene via reduction of graphite edge

被引：11

作者：

Yang, Liangwei ^{[1
]}

Zhao, Fuzhen ^{[1
,2
]}

Zhao, Yan ^{[1
]}

Sun, Yangyong ^{[1
]}

Yang, Guangwu ^{[2
]}

Tong, Lianming ^{[1
]}

Zhang, Jin ^{[1
]}

机构：

[1] Peking Univ, Beijing Natl Lab Mol Sci, Beijing Sci & Engn Ctr Nanocarbons, Ctr Nanochem,Coll Chem & Mol Engn, Beijing 100871, Peoples R China

[2] China Univ Petr, Coll Sci, Qingdao 266580, Peoples R China

来源：

CARBON | 2018年 / 138卷

基金：

中国国家自然科学基金;

关键词：

ELECTROCHEMICAL EXPANSION; CARBON MATERIALS; OXIDE; INTERCALATION; NANOPLATELETS; FLAKES; FILMS;

D O I：

10.1016/j.carbon.2018.07.056

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Graphene has received abundant attentions in many applications because of its extraordinary properties. Liquid-phase exfoliation is one of the most important methods to obtain graphene from graphite. However, due to strong van der Waals interaction force, it is still extremely challenging to further improve the exfoliation efficiency. Here we report that by carrying out reductions with the oxygenic functional groups on the pristine graphite edges using hydrazine hydrate and hydrogen at 800 degrees C as a pretreatment approach, the exfoliation efficiency can be improved by similar to 37% using a lithium-assisted liquid-phase exfoliation approach. The change of the functional groups is characterized by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. The graphene sheets show high degree of structural integrity and few defects. A thin film is prepared from the exfoliated graphene by vacuum assisted filtration and treated by annealing and mechanical compression. The graphene thin film shows a high thermal conductivity of 1707 Wm(-1) K-1, which is superior to that of common metal materials, such as Cu and Al. (C) 2018 Elsevier Ltd. All rights reserved.

引用

页码：390 / 396

页数：7

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