• 文献标题:   Electrical transport phenomenon and variable range hopping conduction in reduced graphene oxide/polystyrene composites
  • 文献类型:   Article
  • 作  者:   EL HASSAN M, DLIMI S, LIMOUNY L, EL OUJDI A, ECHCHELH A, EL KAAOUACHI A
  • 作者关键词:   density of state, rgo/ps, variable range hopping, zabrodskii method
  • 出版物名称:   MOLECULAR CRYSTALS LIQUID CRYSTALS
  • ISSN:   1542-1406 EI 1563-5287
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1080/15421406.2021.1935160 EA MAY 2021
  • 出版年:   2022

▎ 摘  要

In this work, we investigate the temperature dependence of the electrical conductivity of a reduced graphene oxide (RGO)/polystyrene (PS) composites. We re-analysed, in our investigation, the experimental measurements of RGO/PS composites with different RGO concentrations obtained by W. Park et al. We show using two different methods: the Zabrodskii method and a numerical method based on the calculation of the percentage deviation; that the electrical conductivity follows, at the beginning, the Efros-Shklovskii Variable Range Hopping regime (ES VRH) with T-1/2. This behavior showed that long range electron-electron interaction reduces the Density Of State of carriers (DOS) at the Fermi level and creates the Coulomb gap (CG). When the RGO concentration increases, we noticed that the temperature dependence of the electrical conductivity tends toward T-1/3, which may suggest a possible crossover from ES VRH regime to the Mott VRH regime for high RGO concentration values. We also, calculated and represented the Density Of State (DOS) per energy and per area function g(E) for each sample. We noted that the width of parameter Delta representing the half of CG width decreases by increasing the RGO concentration and the function g(E) tends toward the constant g(0) corresponding to the Mott VRH