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  • Title: "Smart" diblock copolymers as templates for magnetic-core gold-shell nanoparticle synthesis.
    Author: Nash MA, Lai JJ, Hoffman AS, Yager P, Stayton PS.
    Journal: Nano Lett; 2010 Jan; 10(1):85-91. PubMed ID: 20017498.
    Abstract:
    We report a new strategy for synthesizing temperature-responsive gamma-Fe(2)O(3)-core/Au-shell nanoparticles (Au-mNPs) from diblock copolymer micelles. The amphiphilic diblock copolymer chains were synthesized using reversible addition-fragmentation chain-transfer (RAFT) with a thermally responsive "smart" poly(N-isopropylacrylamide) (pNIPAAm) block and an amine-containing poly(N,N-dimethylaminoethylacrylamide) (DMAEAm) block that acted as a reducing agent during gold shell formation. The Au-mNPs reversibly aggregated upon heating the solution above the transition temperature of pNIPAAm, resulting in a red-shifted localized surface plasmon resonance.
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