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- W2098992235 abstract "We report on the fabrication of water-dispersible composite silica nanospheres covalently anchored with gold nanoparticles (AuNPs) possessing thermo-tunable spatial distributions at the outer periphery of thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) brushes. Starting from initiator-functionalized silica nanoparticles, surface-initiated atom transfer radical polymerization (ATRP) of N-isopropylacrylamide (NIPAM) afforded hybrid silica nanoparticles coated with PNIPAM brushes. The substitution reaction of halogen terminal groups of grafted PNIPAM chains with sodium azide and subsequent click reaction with 1,2-dithiolane-3-pentanoic acid-N-propargylamide afforded hybrid silica nanoparticles coated with 1,2-dithiolane end-capped PNIPAM brushes. AuNPs were then covalently anchored to the outer periphery of hybrid silica nanoparticles by utilizing strong chemisorption of surface-attached dithiolane moieties to AuNPs. Dynamic laser light scattering (LLS) measurements revealed that thermosensitive PNIPAM brushes at the surface of hybrid silica nanoparticles exhibit reversible thermo-induced collapse/swelling transitions, leading to the facile thermo-modulation of spatial distributions of AuNPs covalently attached at the periphery of composite silica nanospheres and thermo-reversible surface plasmon absorption band shift. The reported strategy of covalent assembly of AuNPs into well-defined composite nanospheres possessing thermo-tunable characteristics might be further exploited for colorimetric temperature sensing and responsive SERS detection purposes." @default.
- W2098992235 created "2016-06-24" @default.
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- W2098992235 date "2012-01-01" @default.
- W2098992235 modified "2023-10-16" @default.
- W2098992235 title "Composite silica nanospheres covalently anchored with gold nanoparticles at the outer periphery of thermoresponsive polymer brushes" @default.
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- W2098992235 doi "https://doi.org/10.1039/c2jm15530c" @default.
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