Electrophilic substitution reaction as a facile and general approach for reactive removal of native ligands from nanocrystals surface
Electrophilic substitution reaction as a facile and general approach for reactive removal of native ligands from nanocrystals surface
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亲电取代反应作为从纳米晶体表面反应去除天然配体的简便且通用的方法
DOI：
10.1088/1361-6528/aae682
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发表时间：
2018
期刊：
影响因子：
3.5
通讯作者：
Zhang Shufen
中科院分区：
文献类型：
--
作者：
Zhao Kai;Niu Wenbin;Wang Yunpeng;Zhang Shufen
表面性质对无机纳米晶(NCS)的物理化学性能有很大影响，是NCS应用的关键因素。在这里，我们报道了一种基于亲电取代反应的简单、通用和通用的NCS表面配体反应去除策略，在该反应中，电泳剂直接与表面系留配体的富电子配位头基反应形成非配位产物。这一过程导致了NC-配体键的断裂，从而实现了表面配体的反应性去除。基于这一策略，各种不同组成和形貌的疏水纳米碳管可以在保持其大小和形状的同时被转移到极性和亲水介质中。更重要的是，与未处理的NCS相比，经过处理的NCS在催化性能和生物学性能上都有了很大的提高。这项工作不仅为NCS表面修饰提供了一种通用的配体去除策略，而且为其在电子、催化和生物技术领域的应用开辟了更多的机会。
Surface property that strongly affects physical and chemical performances of inorganic nanocrystals (NCs) is a key enabler for NCs applications. Here, we report a facile, versatile and general strategy for reactive removal of NCs surface ligands based on electrophilic substitution reaction, in which an electrophile directly reacts with the electron-rich coordinating headgroup of surface-tethered ligands to form a non-coordinating product. This process leads to the break of NC-ligand bond, thereby achieving reactive removal of surface ligands. Based on this strategy, various hydrophobic NCs with different compositions and morphologies can be transferred into polar and hydrophilic media while preserving their size and shape. More importantly, the treated NCs present a great improvement in catalytic and biological performances in comparison with the untreated counterparts. This work not only provides a versatile ligand removal strategy for NCs surface modification but also opens up more opportunities for applications in the fields of electronics, catalysis and biotechnology.