南京师范大学Ya-Qian Lan研究团队的一项最新研究通过对卟啉基COF二维材料后金属化，实现其传感性能的可变修改。2022年1月10日，国际知名学术期刊《德国应用化学》发表了这一成果。

该团队制备了一系列的COF二维纳米材料（基于卟啉的COF纳米片(NS)），能够在室温下对NO₂产生高灵敏度和特异性的传感。与传统的二维传感材料不同，H₂-TPCOF的设计大大减少了层间相互作用，且具有专门设计的卟啉环，为其表面的后金属化提供可修饰位点。

后金属化后的M-TPCOF (M = Co或Cu)的传感性能得到了显著提高。其中，Co-TPCOF对NO₂表现出高特异性的传感，在所有报道的二维材料和COF材料中其灵敏度最高，具有低至6.8 ppb的超低检测限，且响应/恢复速度快。这一工作对设计和制备一种可用于各种应用的新型表面高度改性的二维材料具有重要的指导意义。

研究人员表示，具有柔性表面的二维纳米材料在各种应用领域，特别是在室温化学气体传感领域，是非常受欢迎的。

附：英文原文

Title: Porphyrin-Based COF 2D Materials: Variable Modification of Sensing Performances by Post-Metallization

Author: Ya-Qian Lan, Ming Liu, Yong-Jun Chen, Xin Huang, Long-Zhang Dong, Meng Lu, Can Guo, Daqiang Yuan, Yifa Chen, Gang Xu, Shun-Li Li

Issue&Volume: 2022-01-10

Abstract: 2D nanomaterials with flexibly modifiable surface are extremely desired for various applications, especially in room temperature chemiresistive gas sensing. Here, we have prepared a series of COF 2D nanomaterials (porphyrin-based COF nanosheets (NS)) that enabled highly sensitive and specific-sensing of NO  2  at room temperature. Different from the traditional 2D sensing materials, H  2  -TPCOF was designed with largely reduced interlayer interaction and predesigned porphyrin rings as modifiable sites on its surfaces for post-metallization. After post-metallization, the metallized M-TPCOF (M = Co and Cu) showed remarkably improved sensing performances. Among them, Co-TPCOF exhibited highly specific sensing toward NO  2  with one of the highest sensitivity in all reported 2D materials and COF materials, ultra-low limit-of-detection of 6.8 ppb and fast response/recovery. This work might shed light on designing and preparing a new type of surface-highly-modifiable 2D material for various chemistry applications.

DOI: 10.1002/anie.202115308

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202115308