| 초록 |
Surface enhanced Raman scattering (SERS) has been of great interest as a powerful tool to study vibrational information of molecules adsorbed on metal surfaces. We have developed stimuli-responsive surface enhanced Raman scattering (SERS) substrates by using star-shaped gold nanoparticles (NPs) and thermally-responsive poly(N-isopropylacrylamide-co-allyamine), poly(NIPAM-co-AA). The star-shaped NPs with sharp features prepared in the HEPES buffer showed enormous enhancement of Raman signal as compared to the other metal NPs with anisotropic shapes, and these NPs having negative charges had ionic interaction with positively charged poly(NIPAM-co-AA) on the patterned gold substrate. Thermally-triggered aggregation of poly(NIPAM-co-AA) resulted in increased SERS signal, potentially due to closer proximity between the star-shaped NPs bound to the polymer chain. These SERS substrates with thermally switchable electromagnetic coupling could be useful in chemical detection applications. |
