Controlled dispersion of silver nanoparticles into the bulk of thermosensitive polymer microspheres: tunable plasmonic coupling by temperature detected by surface enhanced Raman scattering.
Macromol Rapid Commun
; 32(13): 1000-6, 2011 Jul 01.
Article
en En
| MEDLINE
| ID: mdl-21604312
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.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Polímeros
/
Plata
/
Nanopartículas del Metal
Idioma:
En
Revista:
Macromol Rapid Commun
Año:
2011
Tipo del documento:
Article
País de afiliación:
China