Agrawal M, Rubio-Retama J, Zafeiropoulos N E, Gaponik N, Gupta S, Cimrova V, Lesnyak V, López-Cabarcos E, Tzavalas S, Rojas-Reyna R, Eychmüller A, Stamm M
Leibniz-Institut fur Polymerforschung Dresden e.V, Hohe Strasse 6, Dresden 01069, Germany.
Langmuir. 2008 Sep 2;24(17):9820-4. doi: 10.1021/la801347d. Epub 2008 Jul 23.
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.
在本研究中，我们报道了一种制备荧光热敏杂化材料的方法，该材料基于覆盖有直径为3.2 nm的碲化镉（CdTe）纳米晶体的单分散热敏聚（N-异丙基丙烯酰胺）（PNIPAM）微凝胶。CdTe纳米晶体通过共价键固定在PNIPAM微凝胶的表面。通过改变温度并引发微凝胶体积相转变来改变CdTe纳米晶体周围的化学环境。这种变化引起了纳米晶体光致发光（PL）强度的急剧变化，使得当温度低于聚合物的低临界溶液温度（LCST）（36℃）时，纳米晶体的PL被强烈猝灭，而在LCST以上，PL强度得以恢复。
