title: Switchable photoluminescence of CdTe nanocrystals by temperature-responsive microgels.
abstract: In the present study, we report a method for preparing a fluorescent thermosensitive hybrid material based on monodisperse, thermosensitive poly( N-isopropyl acrylamide) (PNIPAM) microgels covered with CdTe nanocrystals of 3.2 nm diameter. The CdTe nanocrystals were covalently immobilized on the surface of PNIPAM microgels. The chemical environment around the CdTe nanocrystals was modified by changing the temperature and inducing the microgel volume-phase transition. This change provoked a steep variation in the nanocrystal photoluminescence (PL) intensity in such a way that when the temperature was under the low critical solution temperature (LCST) of the polymer (36 degrees C) the PL of the nanocrystals was strongly quenched, whereas above the LCST the PL intensity was restored.
authors.affiliation: Leibniz-Institut fur Polymerforschung Dresden e.V, Hohe Strasse 6, Dresden 01069, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Agrawal
authors.forename: J
authors.initials: J
authors.lastname: Rubio-Retama
authors.forename: N E
authors.initials: NE
authors.lastname: Zafeiropoulos
authors.forename: N
authors.initials: N
authors.lastname: Gaponik
authors.forename: S
authors.initials: S
authors.lastname: Gupta
authors.forename: V
authors.initials: V
authors.lastname: Cimrova
authors.forename: V
authors.initials: V
authors.lastname: Lesnyak
authors.forename: E
authors.initials: E
authors.lastname: López-Cabarcos
authors.forename: S
authors.initials: S
authors.lastname: Tzavalas
authors.forename: R
authors.initials: R
authors.lastname: Rojas-Reyna
authors.forename: A
authors.initials: A
authors.lastname: Eychmüller
authors.forename: M
authors.initials: M
authors.lastname: Stamm
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000588:Amines / Q000737:chemistry; D019187:Cadmium Compounds / Q000737:chemistry*; D003460:Crystallization; D005782:Gels; D006863:Hydrogen-Ion Concentration; D007477:Ions; D008027:Light; D008832:Microchemistry / Q000379:methods; D053758:Nanoparticles / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods; D011108:Polymers / Q000737:chemistry; D045663:Quantum Dots; D013691:Tellurium / Q000737:chemistry*; D013696:Temperature
chemical_list: D000180:Acrylic Resins; D000588:Amines; D019187:Cadmium Compounds; D005782:Gels; D007477:Ions; D011108:Polymers; C052970:poly-N-isopropylacrylamide; D013691:Tellurium; C028337:cadmium telluride