中山大学郑治坤团队开发出纳米多孔和高导热的单晶共价有机框架带薄膜。相关研究成果于2021年2月25日发表在国际顶尖学术期刊《美国化学会杂志》。

纳米多孔材料作为一种高效的气体和液体吸附剂，是广泛应用于大规模集成电路中的低介电材料。这些应用需要快速传热，而大多数纳米多孔物质是热绝缘体。

该文介绍了在空气-水界面定向生长具有纳米多孔陶瓷结构的微米级单晶共价有机骨架（COFs）带。得到的COFs带相互连接成连续的纯晶体薄膜。由于COFs带之间的牢固连接，整个薄膜可以很容易地转移并可靠地与目标支架接触。在305K下测得的导热系数为～5.31±0.37W m^–1K^–1，这是迄今为止纳米多孔材料导热系数的最高值。

这些发现提供了一种方法，将单晶COFs生长并组装成大面积的集成体，以探索其功能特性，并为需要孔隙率和热导率的三维COFs薄膜的新器件带来可能。

附：英文原文

Title: Nanoporous and Highly Thermal Conductive Thin Film of Single-Crystal Covalent Organic Frameworks Ribbons

Author: Fanglin Tan, Shuo Han, Daoling Peng, Honglei Wang, Jing Yang, Pei Zhao, Xiaojun Ye, Xin Dong, Yuanyuan Zheng, Nan Zheng, Li Gong, Chaolun Liang, Natalie Frese, Armin Glzhuser, Haoyuan Qi, Shanshan Chen, Wei Liu, Zhikun Zheng

Issue&Volume: February 25, 2021

Abstract: Nanoporous materials are widely explored as efficient adsorbents for the storage of gases and liquids as well as for effective low-dielectric materials in large-scale integrated circuits. These applications require fast heat transfer, while most nanoporous substances are thermal insulators. Here, the oriented growth of micrometer-sized single-crystal covalent organic frameworks (COFs) ribbons with nanoporous structures at an air–water interface is presented. The obtained COFs ribbons are interconnected into a continuous and purely crystalline thin film. Due to the robust connectivity among the COFs ribbons, the entire film can be easily transferred and reliably contacted with target supports. The measured thermal conductivity amounts to ～5.31 ± 0.37 W m–1 K–1 at 305 K, which is so far the highest value for nanoporous materials. These findings provide a methodology to grow and assemble single-crystal COFs into large area ensembles for the exploration of functional properties and potentially lead to new devices with COFs thin films where both porosity and thermal conductivity are desired.

DOI: 10.1021/jacs.0c13458

Source: https://pubs.acs.org/doi/10.1021/jacs.0c13458