Zhang Simin, Shi Wenxiong, Siegler Timothy D, Gao Xiaoqing, Ge Feng, Korgel Brian A, He Yan, Li Shuzhou, Wang Xun
Key Laboratory of Organic Optoelectronics and Molecular, Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, China.
School of Materials Science and Engineering, State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin, 300387, China.
Angew Chem Int Ed Engl. 2019 Jun 24;58(26):8730-8735. doi: 10.1002/anie.201902240. Epub 2019 May 21.
Inorganic single crystals with anisotropic structures usually suffer from high brittleness and stiffness. Flexible polymers are used to replace inorganic crystals, but the hot-stretching-induced orientation process is tedious, and oriented molecular chains tend to revert to random coils during aging. To overcome these obstacles and using the similarities between sub-1 nm nanowires (NWs) and linear polymers, we successfully fabricated anisotropic, transparent, flexible, and stable (ATFS) NW films with great potential for optical applications through a wet-spinning method. The NW films show birefringence, and their birefractive index is higher than that of many polymers. They also showed polarized absorption of UV light and anisotropic scattering of visible light. The integrated films composed of NWs and quantum dots showed good fluorescence polarization. The tedious synthesis of quantum rods and fabrication of oriented polymer films can thus be avoided.
具有各向异性结构的无机单晶通常具有高脆性和高刚性。柔性聚合物被用于替代无机晶体，但热拉伸诱导取向过程繁琐，且取向分子链在老化过程中容易恢复为无规线团。为克服这些障碍，并利用亚1纳米纳米线（NWs）与线性聚合物之间的相似性，我们通过湿纺法成功制备了具有光学应用巨大潜力的各向异性、透明、柔性且稳定（ATFS）的NW薄膜。NW薄膜呈现双折射，其双折射指数高于许多聚合物。它们还表现出紫外光的偏振吸收和可见光的各向异性散射。由NWs和量子点组成的集成薄膜表现出良好的荧光偏振。因此可以避免量子棒的繁琐合成和取向聚合物薄膜的制备。
