Preparation and Conductive Behavior of Graphene by Electrochemical Method

doi:10.3969/j.issn.0251-0790.2012.08.031

Abstract

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

CLC Number:

O646

TrendMD:

ZHU Long-Xiu, LI Ying-Zhi, ZHAO Xin, ZHANG Qing-Hua. Preparation and Conductive Behavior of Graphene by Electrochemical Method[J]. Chem. J. Chinese Universities, 2012, 33(08): 1804.

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