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Published on: December 6, 2021
Dangling bond formation on COF nanosheets for enhancing sensing performances
Yong-Jun Chen1,2, Ming Liu3, Jie Chen1
1State Key Laboratory of Structural Chemistry, Fujian Provincial Key Laboratory of Materials and Techniques Toward Techniques Toward Hydrogen Energy, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences (CAS) Fuzhou Fujian 350002 P. R. China lqh2382@fjirsm.ac.cn gxu@fjirsm.ac.cn.
Researchers developed a novel "chemical scissor" strategy to create dangling bonds in covalent organic frameworks (COFs). This method precisely controls dangling bonds, enhancing COF material performance for chemical applications.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Creating dangling bonds in covalent organic frameworks (COFs) is challenging, particularly via post-treatment methods.
- Post-treatment strategies offer facile routes but lack rational design for dangling bond formation.
Purpose of the Study:
- To introduce a novel "chemical scissor" strategy for the rational design of dangling bonds in COF materials.
- To explore the use of Zn2+ coordination as an inducer for controlled dangling bond generation.
Main Methods:
- Post-metallization of TDCOF with Zn2+ to induce bond elongation and fracture during hydrolysis.
- Modulating the number of dangling bonds by controlling post-metallization time.
- Characterization of the resulting COF materials and their gas sensing properties.
Main Results:
- The "chemical scissor" strategy successfully created tunable dangling bonds in COFs.
- Zn2+ coordination effectively initiated bond cleavage, leading to dangling bond formation.
- Zn-TDCOF-12 exhibited high sensitivity to NO2 under visible light and room temperature, outperforming existing materials.
Conclusions:
- This work presents a groundbreaking method for rationally designing dangling bonds in COFs.
- The strategy enhances active sites and mass transport, significantly improving COF applications.
- The developed COF material shows exceptional promise for gas sensing technologies.
