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In Situ Studies of Surface-Plasmon-Resonance-Coupling Sensor Mediated by Stimuli-Sensitive Polymer Linker

Title
In Situ Studies of Surface-Plasmon-Resonance-Coupling Sensor Mediated by Stimuli-Sensitive Polymer Linker
Authors
Lee J.-E.Chung K.Lee J.Shin K.Kim D.H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2015
Journal Title
Advanced Functional Materials
ISSN
1616-301XJCR Link
Citation
vol. 25, no. 43, pp. 6716 - 6724
Keywords
ATRPLSPR couplingPNIPAMSPR sensorstimuli-sensitivity
Publisher
Wiley-VCH Verlag
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
Hybrid plasmonic nanostructures comprising gold nanoparticle (AuNP) arrays separated from Au substrate through a temperature-sensitive poly(N-isopropylacrylamide) (PNIPAM) linker layer are constructed, and unique plasmonic-coupling-based surface plasmon resonance (SPR) sensing properties are investigated. The optical properties of the model system are investigated by in situ and scan-mode SPR analysis. The swelling-shrinking transitions in the polymer linker brush are studied by in situ contact-mode atomic force microscopy at two different temperatures in water. It is revealed that the thickness of the PNIPAM layer is decreased from 30 to 14 nm by increasing the temperature from 20 to 32 °C. For the first time the dependence of the coupling behavior in AuNPs is investigated with controlled density on the temperature in a quantitative manner in terms of the change in SPR signals. The device containing AuNPs with optimized AuNP density shows 3.2-times enhanced sensitivity compared with the control Au film-PNIPAM sample. The refractive index sensing performance of the Au film-PNIPAM-AuNPs is greater than that of Au film-PNIPAM by 19% when the PNIPAM chains have a collapsed conformation above lower critical solution temperature. A plasmonic coupling sensing device is designed, comprising AuNPs separated from the Au substrate in a surface plasmon resonance (SPR) spectrometer through a thermoresponsive polymer layer. The optical properties of the stimuli-responsive sensing devices are investigated by in situ and scan-mode SPR analysis. The Au film-PNIPAM-AuNP system shows markedly enhanced sensitivity toward refractive index sensing due to SPR coupling. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/adfm.201503340
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자연과학대학 > 화학·나노과학전공 > Journal papers
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