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个人信息Personal Information
教授
博士生导师
硕士生导师
性别：男
毕业院校：大连理工大学
学位：博士
所在单位：化工学院
学科：化工过程机械. 安全科学与工程
办公地点：化工实验楼H313
联系方式：Tel./Fax. +86-411-84986274
电子邮箱：jzyin@dlut.edu.cn
Exfoliation of graphite in CO2 expanded organic solvents combined with low speed shear mixing
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论文类型：期刊论文
发表时间：2018-08-01
发表刊物：CARBON
收录刊物：SCIE
卷号：135
页面范围：180-186
ISSN号：0008-6223
关键字：FEW-LAYER GRAPHENE; LIQUID-PHASE EXFOLIATION; SUPERCRITICAL CO2; RAMAN-SPECTROSCOPY; NANOSHEETS; SYSTEMS; OXIDE
摘要：A simple and effectivemethod of producing pristine graphene sheets was investigated in this study. Natural graphite flakes were exfoliated in CO2 expanded N-methylpyrrolidone with a low speed agitation of 1000 rpm followed by 30min sonication. Few-layer graphene were obtained with the concentration of 0.0576 mg/mL after centrifugation at 4000 rpm for 30min. More than 90% of the product were two or three-layer graphene and 12-38% were even monolayer. In addition, ethylene glycol and ethanol were also proved to be effective solvents with the assistance of CO2 intercalation, but they were not good solvents for the exfoliation in the subsequent sonication process. Finally, Agitation time, the system pressure and temperature were systemically investigated to find out more appropriate parameters for the production. (C) 2018 Elsevier Ltd. All rights reserved.