College of Materials Science and Engineering, Key Lab of Guangdong Province for High Property and Functional Macromolecular Materials, South China University of Technology , Guangzhou 510640, P. R. China.
ACS Appl Mater Interfaces. 2016 Sep 14;8(36):24143-51. doi: 10.1021/acsami.6b08587. Epub 2016 Aug 31.
One of the critical issues for the fabrication of desirable sensing materials has focused on the construction of an effective continuous network with a low percolation threshold. Herein, graphene-based elastomer composites with a segregated nanostructured graphene network were prepared by a novel and effective ice-templating strategy. The segregated graphene network bestowed on the natural rubber (NR) composites an ultralow electrical percolation threshold (0.4 vol %), 8-fold lower than that of the NR/graphene composites with homogeneous dispersion morphology (3.6 vol %). The resulting composites containing 0.63 vol % graphene exhibited high liquid sensing responsivity (6700), low response time (114 s), and good reproducibility. The unique segregated structure also provides this graphene-based elastomer (containing 0.42 vol % graphene) with exceptionally high stretchability, sensitivity (gauge factor ≈ 139), and good reproducibility (∼400 cycles) of up to 60% strain under cyclic tests. The fascinating performances highlight the potential applications of graphene-elastomer composites with an effective segregated network as multifunctional sensing materials.
对于理想传感材料的制备，一个关键问题集中在构建具有低渗滤阈值的有效连续网络上。在此，通过一种新颖有效的冰模板策略制备了具有隔离纳米结构石墨烯网络的基于石墨烯的弹性体复合材料。隔离的石墨烯网络赋予天然橡胶（NR）复合材料超低的电渗滤阈值（0.4 体积%），比具有均匀分散形态的 NR/石墨烯复合材料低 8 倍（3.6 体积%）。在含有 0.63 体积%石墨烯的复合材料中，表现出高液体传感响应率（6700）、低响应时间（114 s）和良好的可重复性。这种独特的隔离结构还为基于石墨烯的弹性体（含有 0.42 体积%石墨烯）提供了极高的拉伸性、灵敏度（应变系数≈139）和良好的可重复性（在循环测试中可达 60%应变下约 400 次循环）。引人注目的性能突出了具有有效隔离网络的石墨烯-弹性体复合材料作为多功能传感材料的潜在应用。
