Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University, Beijing, 100083, P. R. China.
College of Materials Science and Engineering, Hunan University, Changsha, 410082, China.
Adv Mater. 2019 Mar;31(10):e1806742. doi: 10.1002/adma.201806742. Epub 2019 Jan 11.
Owing to inherent 2D structure, marvelous mechanical, electrical, and thermal properties, graphene has great potential as a macroscopic thin film for surface coating, composite, flexible electrode, and sensor. Nevertheless, the production of large-area graphene-based thin film from pristine graphene dispersion is severely impeded by its poor solution processability. In this study, a robust wetting-induced climbing strategy is reported for transferring the interfacially assembled large-area ultrathin pristine graphene film. This strategy can quickly convert solvent-exfoliated pristine graphene dispersion into ultrathin graphene film on various substrates with different materials (glass, metal, plastics, and cloth), shapes (film, fiber, and bulk), and hydrophobic/hydrophilic patterns. It is also applicable to nanoparticles, nanofibers, and other exfoliated 2D nanomaterials for fabricating large-area ultrathin films. Alternate climbing of different ultrathin nanomaterial films allows a layer-by-layer transfer, forming a well-ordered layered composite film with the integration of multiple pristine nanomaterials at nanometer scale. This powerful strategy would greatly promote the development of solvent-exfoliated pristine nanomaterials from dispersions to macroscopic thin film materials.
由于其固有的 2D 结构、出色的机械、电气和热性能，石墨烯作为表面涂层、复合材料、柔性电极和传感器的宏观薄膜具有巨大的潜力。然而，从原始石墨烯分散体中制备大面积基于石墨烯的薄膜严重受到其较差的溶液加工性能的阻碍。在这项研究中，报道了一种强大的润湿性诱导的攀附策略，用于转移界面组装的大面积超薄原始石墨烯膜。该策略可以快速将溶剂剥离的原始石墨烯分散体转化为具有不同材料（玻璃、金属、塑料和布）、形状（薄膜、纤维和块状）和疏水性/亲水性图案的各种基底上的超薄石墨烯薄膜。它也适用于纳米颗粒、纳米纤维和其他剥离的二维纳米材料，用于制备大面积超薄薄膜。不同超薄纳米材料薄膜的交替攀附允许逐层转移，形成具有多个原始纳米材料在纳米尺度上集成的有序层状复合薄膜。这种强大的策略将极大地促进从分散体到宏观薄膜材料的溶剂剥离原始纳米材料的发展。
