3D printing of inorganic nanomaterials by photochemically bonding colloidal nanocrystals

• 成果类型: Article
• 署名作者: 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
• 署名单位: Tsinghua University; Chinese Academy of Sciences; Shanghai Institute of Microsystem & Information Technology, CAS; Tsinghua University; Tsinghua University; Tsinghua University; Tsinghua University; Chinese Academy of Sciences; University of Science & Technology of China, CAS
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-8412
• DOI: 10.1126/science.adg6681
• 发表日期: 2023-09-29
• 页码: 1468-1474
• 关键词: size-tunable synthesis; perovskite nanocrystals; core/shell nanocrystals; cross-linkers; quantum dots; thin-films; lithography; deposition; chemistry; reagents

摘要

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 (similar to 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 similar to 0.24 for semiconducting cadmium chalcogenide nanohelical arrays.