Abstract

Graphene oxide (GO), reduced graphene oxide (rGO) and carbon nanotubes (CNTs) have their own advantages in electrical, optical, thermal and mechanical properties. An effective combination of these materials is ideal for preparing transparent conductive films to replace the traditional indium tin oxide films. At present, the preparation conditions of rGO are usually harsh and some of them have toxic effects. In this paper, an SnCl2/ethanol solution was selected as the reductant because it requires mild reaction conditions and no harmful products are produced. The whole process of rGO preparation was convenient, fast and environmentally friendly. Then, SEM, XPS, Raman, and XRD were used to verify the high reduction efficiency. CNTs were introduced to improve the film conductive property. The transmittance and sheet resistance were the criteria used to choose the reduction time and the content ratios of GO/CNT. Thanks to the post-treatment of nitric acid, not only the by-product (SnO2) and dispersant in the film are removed, but also the doping effect occurs, which are all conducive to reducing the sheet resistances of films. Ultimately, by combining rGO, GO and CNTs, transparent conductive films with a bilayer and three-dimensional structure were prepared, and they exhibited high transmittance and low sheet resistance (58.8 Ω/sq. at 83.45 T%, 47.5 Ω/sq. at 79.07 T%), with corresponding {{sigma_{dc} } mathord{left/ {vphantom {{sigma_{dc} } {sigma_{opt} }}} right. kern-nulldelimiterspace} {sigma_{opt} }} values of 33.8 and 31.8, respectively. In addition, GO and rGO can modify the surface and reduce the film surface roughness. The transparent conductive films are expected to be used in photoelectric devices.

Highlights

  • Graphene oxide (GO), reduced graphene oxide and carbon nanotubes (CNTs) have their own advantages in electrical, optical, thermal and mechanical properties

  • An S­ nCl2/ethanol solution was used as the reducing agent to reduce pure GO

  • The results of XPS, Raman, and XRD show that the reagent had good reduction efficiency, and the ratio of C/O achieved was 4.74

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Summary

Introduction

Graphene oxide (GO), reduced graphene oxide (rGO) and carbon nanotubes (CNTs) have their own advantages in electrical, optical, thermal and mechanical properties. By combining rGO, GO and CNTs, transparent conductive films with a bilayer and three-dimensional structure were prepared, and they exhibited high transmittance and low sheet resistance The product obtained by this method has few defects and high quality, which is closest to theoretical graphene. This method requires harsh reaction conditions and has high requirements for the substrate, which makes it difficult to directly apply to the preparation of flexible transparent conductive films. A thin CNT grid structure can obtain CNT conductive films with excellent conductivity This characteristic explains why carbon nanotubes are widely used in transparent conductive ­film[27]. Carbon nanotubes can make up for the loss of resistance caused by defects in graphene

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