Wang Honglei, Yang Jing, Zhao Pei, Gölzhäuser Armin, Liu Wei, Chen Xudong, Zheng Zhikun
Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, Guangdong Engineering Technology Research Center for High-performance Organic and Polymer Photoelectric Functional Films, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, P. R. China.
Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China.
Nanoscale. 2020 Feb 27;12(8):5170-5174. doi: 10.1039/c9nr10858k.
van der Waals (vdW) heterostructures generated by stacking of graphene with other two-dimensional (2D) crystalline sheets have produced a new class of "designer" materials which shows great promise for nanoscience and nanotechnology. However, the 2D sheets are obtained either from nature or synthesized by high-energy procedures, which preclude the design of their structures as well as properties from molecular design on demand. Here, we introduced a rationally designed 2D polymer (one-monomer unit thick, freestanding network composed of periodically linked monomers) as a component for heterostructure construction, and created a 2D polymer-graphene heterostructure. The heterostructure has a high chemical stability, and could be thermally stable up to 400 °C. In the heterostructure, the 2D polymer doped graphene without changing its intrinsic structure, leading to the enhancement of its electric conductivity by a factor of ∼2.5. This piece of work opens the door to tune the properties of graphene heterostructures with rational design for specific applications.
通过将石墨烯与其他二维（2D）晶体片层堆叠而产生的范德华（vdW）异质结构，催生了一类新型的“定制”材料，这类材料在纳米科学和纳米技术领域展现出了巨大的潜力。然而，这些二维片层要么是天然获得的，要么是通过高能工艺合成的，这使得无法根据需求从分子设计的角度来设计它们的结构和性质。在此，我们引入了一种经过合理设计的二维聚合物（由周期性连接的单体组成的单分子层厚、独立的网络结构）作为异质结构构建的一个组分，并制备出了一种二维聚合物-石墨烯异质结构。该异质结构具有高化学稳定性，并且在高达400°C的温度下仍能保持热稳定。在该异质结构中，二维聚合物对石墨烯进行了掺杂，同时又不改变其固有结构，从而使石墨烯的电导率提高了约2.5倍。这项工作为通过合理设计来调控石墨烯异质结构的性质以用于特定应用打开了大门。
