Huang Limei, Xiao Guang, Wang Yunjing, Li Hao, Zhou Yahong, Jiang Lei, Wang Jianfeng
College of Materials Science and Engineering, Hunan University, Changsha, 410082, People's Republic of China.
College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, People's Republic of China.
Nanomicro Lett. 2022 Aug 20;14(1):168. doi: 10.1007/s40820-022-00919-0.
A self-grinding exfoliation strategy that depends on mutual shear friction between flake graphite particles is successfully developed to prepare pristine graphene with largely enhanced yield and productivity. Bioinspired assembly of pristine graphene nanosheets to an interconnected aramid nanofiber network is achieved by a continuous sol-gel-film transformation strategy and generates a flexible yet highly thermoconductive film. Flexible yet highly thermoconductive materials are essential for the development of next-generation flexible electronic devices. Herein, we report a bioinspired nanostructured film with the integration of large ductility and high thermal conductivity based on self-exfoliated pristine graphene and three-dimensional aramid nanofiber network. A self-grinding strategy to directly exfoliate flake graphite into few-layer and few-defect pristine graphene is successfully developed through mutual shear friction between graphite particles, generating largely enhanced yield and productivity in comparison to normal liquid-based exfoliation strategies, such as ultrasonication, high-shear mixing and ball milling. Inspired by nacre, a new bioinspired layered structural design model containing three-dimensional nanofiber network is proposed and implemented with an interconnected aramid nanofiber network and high-loading graphene nanosheets by a developed continuous assembly strategy of sol-gel-film transformation. It is revealed that the bioinspired film not only exhibits nacre-like ductile deformation behavior by releasing the hidden length of curved aramid nanofibers, but also possesses good thermal transport ability by directionally conducting heat along pristine graphene nanosheets.
一种基于片状石墨颗粒间相互剪切摩擦的自研磨剥离策略被成功开发出来，用于制备产率和生产率大幅提高的原始石墨烯。通过连续的溶胶-凝胶-薄膜转变策略，实现了原始石墨烯纳米片与相互连接的芳纶纳米纤维网络的仿生组装，并制备出一种柔性但具有高导热性的薄膜。柔性且高导热的材料对于下一代柔性电子器件的发展至关重要。在此，我们报道了一种基于自剥离原始石墨烯和三维芳纶纳米纤维网络的具有大延展性和高导热性的仿生纳米结构薄膜。通过石墨颗粒间的相互剪切摩擦，成功开发出一种将片状石墨直接剥离成少层、少缺陷原始石墨烯的自研磨策略，与诸如超声处理、高剪切混合和球磨等常规液相剥离策略相比，产率和生产率得到了大幅提高。受珍珠母启发，提出了一种包含三维纳米纤维网络的新型仿生层状结构设计模型，并通过开发的溶胶-凝胶-薄膜转变连续组装策略，用相互连接的芳纶纳米纤维网络和高负载石墨烯纳米片实现了该模型。结果表明，这种仿生薄膜不仅通过释放弯曲芳纶纳米纤维的隐藏长度表现出类似珍珠母的韧性变形行为，还通过沿原始石墨烯纳米片定向传导热量而具有良好的热传输能力。
