Functional Nanomaterials Laboratory, Chinese Academy of Sciences, Zhongguancundonglu 29, Haidianqu, Beijing 100190, China.
Nanoscale. 2012 Jun 7;4(11):3558-66. doi: 10.1039/c2nr30606a. Epub 2012 May 10.
We report a new approach for the fabrication of flexible and transparent conducting thin films via the layer-by-layer (LbL) assembly of oppositely charged reduced graphene oxide (RGO) and the benign step-by-step post-treatment on substrates with a low glass-transition temperature, such as glass and poly(ethylene terephthalate) (PET). The RGO dispersions and films were characterized by means of atomic force microscopy, UV-visible absorption spectrophotometery, Raman spectroscopy, transmission electron microscopy, contact angle/interface systems and a four-point probe. It was found that the graphene thin films exhibited a significant increase in electrical conductivity after the step-by-step post-treatments. The graphene thin film on the PET substrate had a good conductivity retainability after multiple cycles (30 cycles) of excessively bending (bending angle: 180°), while tin-doped indium oxide (ITO) thin films on PET showed a significant decrease in electrical conductivity. In addition, the graphene thin film had a smooth surface with tunable wettability.
我们报告了一种通过相反电荷的还原氧化石墨烯（RGO）的层层（LbL）组装，并对玻璃和聚对苯二甲酸乙二醇酯（PET）等玻璃化转变温度低的基底进行温和的逐步后处理来制造柔性透明导电薄膜的新方法。RGO 分散体和薄膜通过原子力显微镜、紫外-可见吸收分光光度计、拉曼光谱、透射电子显微镜、接触角/界面系统和四点探针进行了表征。结果发现，经过逐步后处理，石墨烯薄膜的电导率显著提高。PET 基底上的石墨烯薄膜在多次（30 次）过度弯曲（弯曲角：180°）后仍具有良好的导电性保持率，而 PET 上的掺锡氧化铟（ITO）薄膜的电导率则显著下降。此外，石墨烯薄膜具有光滑的表面和可调节的润湿性。
