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Thermoresponsive chiral plasmonic nanoparticles.

Yiyi Liu1, Tharaka Perera2, Qianqian Shi1

  • 1Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia. wenlong.cheng@monash.edu.

Nanoscale
|March 4, 2022
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Summary
This summary is machine-generated.

Chiral gold nanorods modified with thermoresponsive polymers show tunable plasmonic circular dichroism. This temperature-dependent response is reversible and enhances nanoparticle-based optical applications.

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Area of Science:

  • Nanotechnology
  • Plasmonics
  • Chiroptical Spectroscopy

Background:

  • Chiral metallic nanoparticles exhibit unique plasmonic circular dichroism (PCD) in the UV-Vis spectrum.
  • Controlling PCD is crucial for advanced optical applications.

Purpose of the Study:

  • To investigate the influence of thermoresponsive dielectric nanoenvironments on PCD.
  • To explore the use of poly(N-isopropylacrylamide) (PNIPAM) to modify chiral gold nanorods (AuNRs).

Main Methods:

  • Synthesis of PNIPAM-modified chiral AuNRs.
  • Temperature-dependent UV-Vis spectroscopy to measure PCD.
  • Computational simulations to understand the mechanism.

Main Results:

  • PNIPAM-modified AuNRs showed temperature-dependent PCD with red-shifted peaks and enhanced intensities at 50 °C compared to 20 °C.
  • Unmodified AuNRs exhibited no significant peak shift or intensity change with temperature.
  • PNIPAM chain collapse upon heating increased the local refractive index, enhancing PCD.

Conclusions:

  • Thermoresponsive nanoenvironments can effectively tune the PCD of chiral plasmonic nanoparticles.
  • The observed effects are reversible, general, and applicable to other chiral plasmonic systems.
  • This provides a novel strategy for designing switchable chiroptical nanomaterials.