高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (08): 1804-1808.doi: 10.3969/j.issn.0251-0790.2012.08.031

• 物理化学 • 上一篇    下一篇

电化学法制备石墨烯及其导电特性

朱龙秀, 李英芝, 赵昕, 张清华   

  1. 东华大学材料科学与工程学院, 纤维材料改性国家重点实验室, 上海 200051
  • 收稿日期:2011-11-22 出版日期:2012-08-10 发布日期:2012-08-10
  • 通讯作者: 张清华, 男, 教授, 主要从事高性能纤维和纳米复合材料的研究. E-mail: qhzhang@dhu.edu.cn E-mail:qhzhang@dhu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 51173024)和教育部博士点基金(批准号: 20110075110009)资助.

Preparation and Conductive Behavior of Graphene by Electrochemical Method

ZHU Long-Xiu, LI Ying-Zhi, ZHAO Xin, ZHANG Qing-Hua   

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
  • Received:2011-11-22 Online:2012-08-10 Published:2012-08-10

摘要: 采用电化学方法将石墨层电解剥离, 得到分散于电解质溶液的结构较为完整的石墨烯. 用透射电子显微镜和拉曼光谱分析了石墨烯的形貌和结构, 利用四探针法测定了石墨烯导电特性. 实验数据和理论拟合结果表明, 当100 K<T<200 K时, 石墨烯中载流子的传导服从二维的变程跳跃(VRH)模型; 当200 K<T<500 K时, 载流子从费米能级以下的能量状态被激发到迁移率边以上的能级, 具有导电性, 服从热激活(TA)模型.

关键词: 石墨烯, 电化学法, 电导率

Abstract: A one-step electrochemical approach was employed to produce graphene dispersion with the perfect structure and excellent conductive property by exfoliation of graphite in electrolyte. Transmission electron microscopy and Raman spectroscopy were used to characterize morphology and structure of the as-prepared graphene. Four-probe method was employed to measure the conductivity of the graphene, and the temperature dependent conductivity was investigated by model fitting. At low temperature range of 100 K<T<120 K, carrier transport behavior is explained by two-dimensional variable range hopping based on the σ-exp temperature dependence. At high temperature range of 200 K<T<500 K, the dependence of conductivity on the temperature is consistent with the express of σ-exp(-ΔE/k0T), and thus carrier transport behavior is well described by thermal activation model. In addition, the outstanding electrical properties suggest that high quality of graphene with less defect can be obtained. This simple method offers a great promise in production of large-scale graphene platelets to meet extensive applications.

Key words: Graphene, Electrochemical method, Conductivity

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