Issue 8, 2023

Stimuli-responsive plasmonic core–satellite hybrid nanostructures with tunable nanogaps

Abstract

Incorporating stimuli-responsive block copolymers to hierarchical metallic nanoparticles (MNPs) is of particular interest due to their tunable plasmonic properties responding to environmental stimuli. We herein report thermo-responsive plasmonic core–satellite hybrid nanostructures with tunable nanogaps as surface-enhanced Raman scattering (SERS) nanotags. Two different diblock copolymers with opposite charges, poly(acrylic acid-b-N-isopropylacrylamide) (p(AAc-b-NIPAM)) and poly(N,N-dimethylaminoethyl methacrylate-b-N-isopropylacrylamide) (p(DMAEMA-b-NIPAM)), were synthesized. The negatively charged p(AAc-b-NIPAM)s were bound to gold nanospheres (GNSs), while the positively charged p(DMAEMA-b-NIPAM)s were conjugated to gold nanorods (GNRs) via gold–sulfur bonds. When p(AAc-b-NIPAM)-GNSs and p(DMAEMA-b-NIPAM)-GNRs were electrostatically complexed, plasmonic hybrid nanostructures consisting of both GNS satellites and a GNR core were formed. Dynamic tuning of electromagnetic coupling of their nanogaps was achieved via a temperature-triggered conformational change of p(NIPAM) blocks. Furthermore, a sandwich-type immunoassay for the detection of immunoglobulin G was performed to demonstrate these core–satellites as potential SERS nanotags. Our results showed that these plasmonic core–satellites with stimuli-responsiveness are promising for SERS-based biosensing applications.

Graphical abstract: Stimuli-responsive plasmonic core–satellite hybrid nanostructures with tunable nanogaps

Supplementary files

Article information

Article type
Paper
Submitted
21 Nov 2022
Accepted
09 Jan 2023
First published
10 Jan 2023

J. Mater. Chem. B, 2023,11, 1692-1704

Stimuli-responsive plasmonic core–satellite hybrid nanostructures with tunable nanogaps

E. Y. Hwang, J. H. Lee, M. J. Kang and D. W. Lim, J. Mater. Chem. B, 2023, 11, 1692 DOI: 10.1039/D2TB02546A

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