Li Fu, Liu Shao-Feng, Liu Wangyu, Hou Zheng-Wei, Jiang Jiaxi, Fu Zhong, Wang Song, Si Yilong, Lu Shaoyong, Zhou Hongwei, Liu Dan, Tian Xiaoli, Qiu Hengwei, Yang Yuchen, Li Zhengcao, Li Xiaoyan, Lin Linhan, Sun Hong-Bo, Zhang Hao, Li Jinghong
Department of Chemistry, Center for Bioanalytical Chemistry, Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Tsinghua University, Beijing 100084, China.
Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China.
Science. 2023 Sep 29;381(6665):1468-1474. doi: 10.1126/science.adg6681. Epub 2023 Sep 28.
3D printing of inorganic materials with nanoscale resolution offers a different materials processing pathway to explore devices with emergent functionalities. However, existing technologies typically involve photocurable resins that reduce material purity and degrade properties. We develop a general strategy for laser direct printing of inorganic nanomaterials, as exemplified by more than 10 semiconductors, metal oxides, metals, and their mixtures. Colloidal nanocrystals are used as building blocks and photochemically bonded through their native ligands. Without resins, this bonding process produces arbitrary three-dimensional (3D) structures with a large inorganic mass fraction (~90%) and high mechanical strength. The printed materials preserve the intrinsic properties of constituent nanocrystals and create structure-dictated functionalities, such as the broadband chiroptical responses with an anisotropic factor of ~0.24 for semiconducting cadmium chalcogenide nanohelical arrays.
具有纳米级分辨率的无机材料3D打印提供了一条不同的材料加工途径，以探索具有新兴功能的器件。然而，现有技术通常涉及光固化树脂，这会降低材料纯度并使性能退化。我们开发了一种用于无机纳米材料激光直接打印的通用策略，超过10种半导体、金属氧化物、金属及其混合物就是例证。胶体纳米晶体用作构建单元，并通过其天然配体进行光化学结合。无需树脂，这种结合过程就能产生具有大无机质量分数（约90%）和高机械强度的任意三维（3D）结构。打印材料保留了组成纳米晶体的固有特性，并产生结构决定的功能，例如对于半导体硫族镉化物纳米螺旋阵列，具有约0.24的各向异性因子的宽带手性光学响应。
