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    徐琴琴

    • 副教授     博士生导师   硕士生导师
    • 性别:女
    • 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. 流体机械及工程. 安全科学与工程
    • 办公地点:西部校区H315
    • 联系方式:qinqinxu@dlut.edu.cn
    • 电子邮箱:qinqinxu@dlut.edu.cn

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    The production of graphene using impinging jet exfoliation in a binary system of CO2 and N-methyl pyrrolidone

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    论文类型:期刊论文

    第一作者:Xu Qin-Qin

    合写作者:Zhi Jia-Tao,Zhu Hong-Yue,Qi Jian-Lei,Yin Jian-Zhong,Wang Zhi-Gang,Wang Qi-Bo

    发表时间:2020-03-12

    发表刊物:Nanotechnology

    收录刊物:PubMed

    卷号:31

    期号:26

    页面范围:265601

    ISSN号:1361-6528

    关键字:Exfoliation,Graphene,Impinging jets,Supercritical CO2

    摘要:High quality and high quantity few-layer graphene was successfully prepared using a new impinging jet method. Natural graphite flakes were first agitated in N-methyl pyrrolidone (NMP) with the assistance of supercritical CO2, then the half-exfoliated graphite was further stripped using the shear stress derived from the impinging jets. After the energy conversion and stress analysis of the graphite particles during the whole exfoliation process, it was revealed that the size of the target mesh, the distance between the nozzle and the target, the decompression rate, and the size of the raw materials had a significant influence on the exfoliation process. Additionally, a microscopic view of the exfoliation and dispersion mechanism of graphene in the CO2-NMP system was investigated using molecular dynamics simulation, and CO2 was found to be beneficial for the penetration of NMP into the graphite sheets. Finally, the concentration and quality characteristics of the prepared graphene were characterized using ultraviolet-visible spectroscopy, transmission electron microscopy, Raman spectroscopy, and atomic force microscopy. The maximum concentration was as high as 0.689 mg ml-1, the thickness of 68% of the product was less than 2.5 nm, and the lateral dimension was from 0.5 to 3.0 μm. These results indicate that this impinging jet method is promising for large-scale industrial production.