Encapsulation of AgInS2/GaSx core/shell quantum dots in In-fumarate metal-organic frameworks for stability enhancement
Encapsulation of AgInS2/GaSx core/shell quantum dots in In-fumarate metal-organic frameworks for stability enhancement
复制标题
将 AgInS2/GaSx 核/壳量子点封装在 In-富马酸盐金属有机框架中以增强稳定性
DOI：
10.1039/d2ce00343k
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发表时间：
2022
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：
Tepakidareekul Manunya;Uematsu Taro;Torimoto Tsukasa;Kuwabata Susumu
银硫化铟/硫化镓（AgInS 2/GaSx）核/壳量子点（QD）是具有窄带边发射的无镉替代物之一，近年来引起了极大的关注。然而，由于化学敏感的GaSx壳层的光致发光（PL）的稳定性不足，这部分是由于钝化配体容易解吸，仍然是其实际应用的问题。在这项研究中，一个简单而有效的方法来保护这些量子点。将AgInS 2/GaSx核/壳量子点封装到由富马酸铟有序结构（InMOFs）组成的金属有机框架（MOFs）中。然而在包封反应期间可能会发生对壳的损坏，所获得的复合（AgInS 2/GaSx@InMOFs）保持窄带边发射，其与原始AgInS 2/GaSx核/壳QD基本相同，在合成优化后PL量子产率（PL QY）为12.6%。包封结果使得复合物的光谱形状和PL QY能够在7天后保持，这证明了包封在InMOF中的QD的高稳定性。
Silver indium sulfide/gallium sulfide (AgInS2/GaSx) core/shell quantum dots (QDs), among the cadmium-free alternatives that possess a narrow band-edge emission, have attracted immense attention in recent years. However, the insufficient stability of photoluminescence (PL) due to chemically sensitive GaSx shells, which is partly caused by easy desorption of passivated ligands, remained a problem for their practical application. In this study, a simple and efficient method to protect these QDs is presented. The AgInS2/GaSx core/shell QDs are encapsulated into metal–organic frameworks (MOFs) consisting of an indium-fumarate ordered structure (InMOFs). Whereas damage to the shell during the encapsulation reaction can potentially occur, the obtained composite (AgInS2/GaSx@InMOFs) maintains a narrow band-edge emission that is mostly identical to the pristine AgInS2/GaSx core/shell QDs with a PL quantum yield (PL QY) of 12.6% after optimization of the synthesis-solution pH. The encapsulation result enables the spectral shape and PL QY of the composite to be maintained after 7 days, which demonstrates the high stability of the QDs encapsulated in InMOFs.