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Nanostructured thermoresponsive quantum dot/PNIPAM assemblies |
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| Authors: | Oya Tagit Dominik Jańczewski Ming Yong Han Jennifer L. Herek |
| Affiliation: | a Materials Science and Technology of Polymers, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands b Optical Sciences, Faculty of Science and Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands c Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore d Division of Bioengineering, Faculty of Engineering, National University of Singapore, Singapore 117576, Singapore |
| Abstract: | Synthesis, characterization, and applications of novel thermoresponsive polymeric coatings for quantum dots (QDs) are presented. Comb-copolymers featuring hydrophobic alkyl groups, carboxylic groups and poly(N-isopropylacrylamide) (PNIPAM) side chains with molar masses ranging from 1000 g/mol to 25,400 g/mol were obtained. The amphiphilic comb-copolymers were shown to efficiently transfer the QDs to aqueous media. The PNIPAM-coated QD materials display a lower critical solution temperature (LCST). The absorbance, luminescence emission, size of the assemblies, and electrophoretic mobility were followed as a function of temperature and the reversibility of the temperature induced changes is demonstrated by cyclic heating and cooling. |
| Keywords: | Stimuli responsive polymer PNIPAM Quantum dots Reversible switching of luminescence |
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