In:
Macromolecular Rapid Communications, Wiley, Vol. 32, No. 13 ( 2011-07), p. 1000-1006
Abstract:
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 °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. magnified image
Type of Medium:
Online Resource
ISSN:
1022-1336
,
1521-3927
DOI:
10.1002/marc.201100143
Language:
English
Publisher:
Wiley
Publication Date:
2011
detail.hit.zdb_id:
1475027-2
