Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold

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Tagit, Oya and Tomczak, Nikodem and Benetti, Edmondo M. and Cesa, Yanina and Blum, Christian and Subramaniam, Vinod and Herek, Jennifer L. and Vancso, G. Julius (2009) Temperature-modulated quenching of quantum dots covalently coupled to chain ends of poly(N-isopropyl acrylamide) brushes on gold. Nanotechnology, 20 (181). p. 185501. ISSN 0957-4484

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Abstract:A thermo-responsive polymer/quantum dot platform based on poly(N-isopropyl acrylamide) (PNIPAM) brushes 'grafted from' a gold substrate and quantum dots (QDs) covalently attached to the PNIPAM layer is presented. The PNIPAM brushes are grafted from the gold surface using an iniferter-initiated controlled radical polymerization. The PNIPAM chain ends are functionalized with amine groups for coupling to water-dispersible COOH-functionalized QDs. Upon increasing the temperature above the lower critical solution temperature (LCST) of PNIPAM the QD luminescence is quenched. The luminescence was observed to recover upon decreasing the temperature below the LCTS. The data obtained are consistent with temperature-modulated thickness changes of the PNIPAM layer and quenching of the QDs by the gold surface via nonradiative energy transfer.
Item Type:Article
Copyright:© 2009 IOP Science
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/71158
Official URL:http://dx.doi.org/10.1088/0957-4484/20/18/185501
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