Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 32, Issue 13, Pages 1000-1006Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201100143
Keywords
microgels; nanoparticles; Raman spectroscopy; synthesis; thermal properties
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Funding
- National Natural Science Foundation of China [50725208, 51002007]
- National Basic Research Program of China [2010CB934700]
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By in situ reduction of Ag+ ions pre-dispersed inside thermosensitive microspheres of poly[(N-isopropylacrylamide)-co-(methacrylic acid)] (P(NIPAM-co-MAA)), a 3D copolymer-supported network of silver nanoparticles is created and extensively characterized by surface-enhanced Raman scattering (SERS). The effective dispersion and the suitable density of the silver nanoparticles in the composite microspheres are demonstrated by the thermal-induced SERS signal and its high reproducibility during thermocycling. When the temperature of the system increases above 32 degrees C, spatial separation of the silver nanoparticles decreases and the numbers of Ag nanoparticles and P(NIPAM-co-MAA) microspheres under illumination spot increase as a result of the shrinkage of the P(NIPAM-co-MAA) chains, leading to the ramp of the SERS effect. By means of the high reversibility of the thermosensitive phase transition of the P(NIPAM-co-MAA) microspheres, SERS activity of the silver nanoparticle network embedded in the microsphere can be well controlled by thermal-induced variation of special separation.
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