• 文献标题:   Improvement in the electro-optical and electronic properties of the reduced graphene oxide dispersed in a liquid crystalline material 4'-octyl-4-cyano-biphenyl
  • 文献类型:   Article, Early Access
  • 作  者:   SINGH PK, DUBEY P, DHAR R, DABROWSKI R
  • 作者关键词:   liquid crystal, reduced graphene oxide, dielectric anisotropy, threshold voltage, dc conductivity
  • 出版物名称:   LIQUID CRYSTALS
  • ISSN:   0267-8292 EI 1366-5855
  • 通讯作者地址:  
  • 被引频次:   0
  • DOI:   10.1080/02678292.2022.2142880 EA NOV 2022
  • 出版年:   2022

▎ 摘  要

Herein, a small concentration (0.05 wt %) of reduced graphene oxide is dispersed in the liquid crystalline media. Thermodynamic study shows the reduction of the transition temperature, enthalpy and entropy of the reduced graphene oxide dispersed nanocomposite. Optical study suggests the decrease of the optical bandgap of the dispersed nanocomposite as compared to that of the pure sample. Dielectric spectroscopic measurement is done for measuring the permittivity and conductivity of the pure and the dispersed samples. The value of dielectric anisotropy has decreased for the dispersed nanocomposite whereas the value of ionic (DC) conductivity of the dispersed nanocomposite has increased by 3 orders of the magnitude as compared to that of the pristine sample. The activation energy for DC conductivity has reduced in the dispersed nanocomposite which is responsible for the increment in DC conductivity of the system. The cut-off region of DC conductivity has increased in the dispersed nanocomposite. Electro-optical studies suggest the reduction of the threshold voltage for the Freedericksz transition, splay elastic constant and rotational viscosity for the dispersed nanocomposite.