| 초록 |
A variety of surface enhanced Raman scattering (SERS) substrates have been widely investigated as highly sensitive platform for quantitative analysis of chemicals. In this work, we reported systematic studies of thermally-tuned plasmonic coupling of stimuli-responsive SERS substrates composed of gold nanostars and temperature sensitive poly(N-isopropylacrylamide-co-allyamine), poly(NIPAM-co-AA). Positively charged poly(NIPAM-co-AA)s tethered on a self-assembled monolayer (SAM) of a patterned gold substrate were complexed with negatively charged gold nanostars having sharp edges via strong ionic interaction. Temperature, chain length of poly(NIPAM-co-AA), molecular density in the SAM affected SERS signal. Especially, thermally-triggered collapse of poly(NIPAM-co-AA) chains produced enhanced SERS signal due to thermally-tuned plasmonic coupling. Synthesis, characterization, and optimization of these SERS substrates could open a new avenue for SERS-based sensing applications. |
