▎ 摘　　要

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