Interactions between redox complexes and semiconductor quantum dots coupled via a peptide bridge.
Interactions between redox complexes and semiconductor quantum dots coupled via a peptide bridge.
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DOI：
10.1021/ja805456x
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发表时间：
2008-12-10
影响因子：
15
通讯作者：
Mattoussi, Hedi
中科院分区：
文献类型：
--
作者：
Medintz, Igor L.;Pons, Thomas;Trammell, Scott A.;Grimes, Amy F.;English, Doug S.;Blanco-Canosa, Juan B.;Dawson, Philip E.;Mattoussi, Hedi
胶体量子点 (QD) 的大部分原子排列在其表面，并被双功能配体覆盖，这使得它们的光致发光对来自周围环境的潜在电荷转移高度敏感。在本报告中，我们使用肽作为 CdSe-ZnS QD 和金属配合物之间的桥梁，以促进金属配合物和 QD 之间的电荷转移。我们发现量子点发射的猝灭高度依赖于量子点和所用金属配合物的氧化水平的相对位置；它还追踪了靠近纳米晶体表面的金属络合物的数量。此外，还测量了 QD-金属络合物组件的吸收部分漂白。这些邻近驱动的相互作用进一步用于构建传感组件以检测蛋白水解酶活性。
Colloidal quantum dots (QDs) have a large fraction of their atoms arrayed on their surfaces and are capped with bifunctional ligands, which make their photoluminescence highly sensitive to potential charge transfer to, or from, the surrounding environment. In this report, we used peptides as bridges between CdSe-ZnS QDs and metal complexes to promote charge transfer between the metal complexes and QDs. We found that quenching of the QD emission is highly dependent on the relative position of the oxidation levels of QDs and metal complex used; it also traces the number of metal complexes brought in close proximity of the nanocrystal surface. In addition, partial bleaching of the absorption was measured for the QD-metal complex assemblies. These proximity driven interactions were further used to construct sensing assemblies to detect proteolytic enzyme activity.
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