title: A facile strategy to fabricate thermoresponsive polymer functionalized CdTe/ZnS quantum dots: assemblies and optical properties.
abstract: 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.
authors.affiliation: College of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.
authors.forename: Bingxin
authors.initials: B
authors.lastname: Liu
authors.forename: Cuiyan
authors.initials: C
authors.lastname: Tong
authors.forename: Lijuan
authors.initials: L
authors.lastname: Feng
authors.forename: Chunyu
authors.initials: C
authors.lastname: Wang
authors.forename: Yao
authors.initials: Y
authors.lastname: He
authors.forename: Changli
authors.initials: C
authors.lastname: Lü
mesh_terms: D019187:Cadmium Compounds / Q000737:chemistry*; D031541:Fluorescence Resonance Energy Transfer; D046529:Microscopy, Electron, Transmission; D011108:Polymers / Q000737:chemistry*; D045663:Quantum Dots; D013440:Sulfides / Q000737:chemistry*; D013691:Tellurium / Q000737:chemistry*; D017967:Zinc Compounds / Q000737:chemistry*
chemical_list: D019187:Cadmium Compounds; D011108:Polymers; D013440:Sulfides; D017967:Zinc Compounds; C031238:zinc sulfide; D013691:Tellurium; C028337:cadmium telluride
keywords: 8- hydroxyquinoline; CdTe/ZnS quantum dots; assemblies; optical properties; thermoresponsive copolymers