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Optoelectronics properties of broad-band reflectors improved by doping graphene modified with azobenzol group

J. ZHANG1, D. WANG2, X. WANG2, H. GAO1,* , Y. XING1, Z. YANG2

Affiliation

  1. China Academy of Space Technology, China, Beijing 100094, PR China
  2. School of Materials Science and Engineering, University of Science and Technology Beijing, China, Beijing 100083, PR China

Abstract

NH2-terminated mesogenic group azobenzol was chemically grafted onto graphene (GOre) via amidation reaction. The resultant mesogenic group modified GO sheets (GOre-Az) were easily redispersed in common organic solvents or liquid crystals (LCs), facilitating the structure characterization and the device fabrication by solution processing. Broad-band reflectors could be obtained by doped different contents of GOre-Az nanosheets into chiral nematic liquid crystals (N*-LCs) media to a photo-polymerization. Experimental results showed that both the bandwidth of the reflection spectra and the location of reflection band of the GOre-Az doped composite films were better than the N*-LCs sample without GOre-Az. Effect of polymerization temperatures and doped contents of GOre-Az on the broad-band reflection of N*-LC composite films was investigated. The experimental results show that the doping nanomaterials can improve the performance of the LC medium. Our observations open up new possible applications for GO nanomaterials in intelligent optoelectronics industry, including reflective color displays, smart reflective windows..

Keywords

Liquid crystals, Graphene, Nanosheets, Broad-band reflector, Non-uniform pitch.

Submitted at: Nov. 18, 2015
Accepted at: Feb. 10, 2017

Citation

J. ZHANG, D. WANG, X. WANG, H. GAO, Y. XING, Z. YANG, Optoelectronics properties of broad-band reflectors improved by doping graphene modified with azobenzol group, Journal of Optoelectronics and Advanced Materials Vol. 19, Iss. 1-2, pp. 6-10 (2017)