College of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.
Macromol Rapid Commun. 2014 Jan;35(1):77-83. doi: 10.1002/marc.201300634. Epub 2013 Nov 27.
Novel thermoresponsive CdTe/ZnS quantum dots (QDs) decorated with a copolymer ligand (CPL) containing 8-hydroxyquinoline and NIPAM units are prepared through coordinate bonding in aqueous solution. The dependence of the morphology and optical properties of the QDs/CPL assemblies formed via coordinate bonding on the experimental conditions is studied. The coordinate induced self-assemblies are observed by controlling the molar ratio of QDs and CPL. The self-organized structure of QDs/CPL proceeds through a first step of QDs-chains, followed by a necklace-like single annular chain, and subsequently increases its annular chain structure, forming a network. The CPL functionalized QDs can emit multiple colors from the cooperating interaction between the inherent emission (606 nm) of the QDs and the surface-coordinated emission (517 nm) of the CPL complex formed on the QD surface. For QDs-CPL systems, both Förster resonance energy transfer (FRET) and a high rate of photoinduced electron transfer (PET) are simultaneous, the latter mainly contributing to PL quenching. The thermoresponsive QDs/CPL assemblies also exhibit dual reversible PL properties between the inherent emission of QDs and surface-coordinated emission.
通过在水溶液中配位键合，制备了一种新型的温敏 CdTe/ZnS 量子点（QD），其表面修饰有含有 8-羟基喹啉和 NIPAM 单元的共聚物配体（CPL）。研究了通过配位键合形成的 QD/CPL 组装体的形态和光学性质对实验条件的依赖性。通过控制 QD 和 CPL 的摩尔比来观察配位诱导的自组装。QD/CPL 的自组织结构通过 QD 链的第一步进行，然后是项链状的单个环形链，随后增加其环形链结构，形成网络。CPL 功能化的 QD 可以通过 QD 表面形成的固有发射（606nm）和表面配位发射（517nm）之间的协同相互作用发出多种颜色。对于 QD-CPL 体系，Förster 共振能量转移（FRET）和光诱导电子转移（PET）的速率都很高，后者主要导致 PL 猝灭。温敏 QD/CPL 组装体也表现出 QD 的固有发射和表面配位发射之间的双可逆 PL 性质。
