Self-Controlled Growth of Covalent Organic Frameworks by Repolymerization,Chemistry of Materials

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Self-Controlled Growth of Covalent Organic Frameworks by Repolymerization
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-06-01 , DOI: 10.1021/acs.chemmater.0c01140
Lei Yang _{1,

2} , Qianying Guo _{1,

2} , Hua Kang _{1,

2} , Renzhong Chen _{1,

2} , Yunqi Liu _{2,

3} , Dacheng Wei _{1,

2}

Affiliation

The growth of covalent organic frameworks (COFs) normally goes through a fast polymerization process, which quickly forms amorphous powder and then slowly crystallizes to obtain nanometer-sized crystals. Until now, it is still a challenge to modulate the growth process of COFs, which hampers the controllable synthesis for practical applications. Here, we develop a repolymerization strategy which realizes the self-controlled growth of COFs for the first time. COFs powder is used as starting material that can slowly decompose and release monomers and oligomers. At a self-established equilibrium state of reversible polymerization–decomposition–repolymerization reactions, the monomers and oligomers controllably repolymerize to form a thin crystalline COF film on substrates. The resulting COF film can be directly used as the sensing interface of graphene transistor sensors, which detect NH₃ down to 100 ppt, showing the great potential of this strategy in future applications.

中文翻译：

通过再聚合自我控制共价有机骨架的生长

共价有机骨架（COFs）的生长通常会经历快速聚合过程，该过程会迅速形成无定形粉末，然后缓慢结晶以获得纳米级晶体。到目前为止，调节COF的生长过程仍然是一个挑战，这阻碍了可控合成在实际应用中的发展。在这里，我们开发了一种重新聚合策略，该策略首次实现了COF的自控增长。COFs粉末用作可以缓慢分解和释放单体和低聚物的原料。在可逆聚合－分解－再聚合反应的自平衡状态下，单体和低聚物可控地再聚合，从而在基材上形成薄晶体COF膜。₃降至100 ppt，显示了该策略在未来应用中的巨大潜力。

更新日期：2020-07-14

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