Tian Ying, Guo Ning, Wang Wen-Yi, Geng Wenming, Jing Li-Chao, Wang Tao, Yuan Xiao-Tong, Zhu Zeru, Ma Yicheng, Geng Hong-Zhang
Tianjin Key Laboratory of Advanced Fibers and Energy Storage, School of Material Science and Engineering, Tiangong University, Tianjin, 300387, China.
Carbon Star Technology (Tianjin) Co., Ltd., Tianjin, 300382, China.
Sci Rep. 2021 May 10;11(1):9891. doi: 10.1038/s41598-021-89305-1.
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 SnCl/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 (SnO) 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 [Formula: see text] 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.
氧化石墨烯（GO）、还原氧化石墨烯（rGO）和碳纳米管（CNTs）在电学、光学、热学和力学性能方面各有优势。这些材料的有效组合对于制备透明导电薄膜以替代传统的氧化铟锡薄膜而言是理想的。目前，rGO的制备条件通常较为苛刻，其中一些还具有毒性作用。在本文中，选择SnCl/乙醇溶液作为还原剂，因为其反应条件温和且不产生有害产物。rGO的整个制备过程简便、快速且环保。然后，使用扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、拉曼光谱和X射线衍射（XRD）来验证高还原效率。引入碳纳米管以改善薄膜的导电性能。透过率和方块电阻是用于选择还原时间以及GO/CNT含量比的标准。得益于硝酸的后处理，不仅薄膜中的副产物（SnO）和分散剂被去除，而且还发生了掺杂效应，所有这些都有利于降低薄膜的方块电阻。最终，通过将rGO、GO和碳纳米管相结合，制备出了具有双层和三维结构的透明导电薄膜，它们表现出高透过率和低方块电阻（在83.45%透过率时为58.8Ω/sq，在79.07%透过率时为47.5Ω/sq），相应的[公式：见原文]值分别为33.8和31.8。此外，GO和rGO可以修饰表面并降低薄膜表面粗糙度。这些透明导电薄膜有望用于光电器件。
