Direct surface modification of semiconductor quantum dots with metal-organic frameworks
Direct surface modification of semiconductor quantum dots with metal-organic frameworks
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DOI：
10.1039/c9ce00769e
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发表时间：
2019-10-07
期刊：
影响因子：
3.1
通讯作者：
Kuwabata, Susumu
中科院分区：
文献类型：
--
作者：
Kumagai, Kohei;Uematsu, Taro;Kuwabata, Susumu
为了实现发光半导体量子点（QD）的长期稳定性，在实际应用中需要有不同于传统有机配体的坚固的表面保护材料。在众多替代材料中，金属 - 有机框架（MOF）因其绝缘或半导体特性以及材料设计的多功能性，有望成为功能性稳定剂。在此，提出了一种制备量子点@金属 - 有机框架（QD@MOF）复合材料的新策略，在量子点和类金属 - 有机框架聚合物之间不使用任何粘结材料。在量子点和金属 - 有机框架之间形成直接键合对于利用两种材料的协同效应是理想的。将金属 - 有机框架前体逐滴加入到量子点溶液中（量子点的配体已被交换为易于脱离的吡啶衍生物），证明了金属 - 有机框架在量子点直接表面上的生长。研究了在合成反应过程中金属 - 有机框架前体的引入方式如何影响量子点在金属 - 有机框架中的结合情况。所得的量子点@金属 - 有机框架复合材料在固态下发出强烈的光致发光，并且通过该复合材料对光致发光猝灭测试无响应，证明了金属 - 有机框架完全覆盖在量子点表面。
Robust surface protective materials for practical applications of luminescent semiconductor quantum dots (QDs) that differ from conventional organic ligands are required for long-term QD stability. Among the alternatives, metal-organic frameworks (MOFs) are expected to act as functional stabilizers because of their insulating or semiconducting properties and the versatility of material design. Here, a new strategy for developing a QD@MOF composite is proposed without any bonding materials between the QD and MOF-like polymers. Forming a direct bond between QDs and MOFs is desirable for exploiting the synergistic effects of both materials. The dropwise addition of MOF precursors into QD solutions, ligands of which have been exchanged to easily detach pyridine derivatives, demonstrates the growth of MOFs on the direct surface of QDs. How these QDs are incorporated in MOFs is investigated in relation to the manner of MOF precursor introduction during the synthesis reaction. The resulting QD@MOF composite emits intense photoluminescence in the solid state, and complete coverage of the MOF on the QD surface was demonstrated by the unresponsiveness of the composite to photoluminescence quenching tests.