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Plasmonic vesicles with tailored collective properties.

Hui Sun1, Jianzhong Du

  • 1Department of Orthopedics, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai 200072, China. jzdu@tongji.edu.cn.

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|September 11, 2018
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Summary
This summary is machine-generated.

Temperature-triggered assembly of gold nanoparticles on responsive vesicles enhances plasmonic properties. This creates tunable hot spots for improved surface-enhanced Raman scattering (SERS) and local surface plasmon resonance (LSPR).

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Plasmonic nanoparticle assemblies exhibit unique collective properties not found in individual nanoparticles.
  • Controlling nanoparticle arrangement and inter-particle distance is crucial but challenging for manipulating these properties.
  • Existing methods for tuning plasmonic properties often lack precise control over nanoparticle spacing.

Purpose of the Study:

  • To develop a strategy for manipulating the distance between gold nanoparticles on plasmonic vesicles.
  • To achieve tunable collective plasmonic properties by temperature-induced changes.
  • To create temperature-responsive plasmonic vesicles for enhanced optical applications.

Main Methods:

  • Self-assembly of a thermally responsive vesicle from an azobenzene-terminated homopolymer, poly(2-(2-ethoxyethoxy)ethyl acrylate) (Azo-PEEA).
  • Decoration of the vesicle membrane with gold nanoparticles to form plasmonic vesicles.
  • Heating the plasmonic vesicles to induce grouping and fusion, bringing gold nanoparticles closer.

Main Results:

  • Heating causes plasmonic vesicles to group and fuse, decreasing the distance between gold nanoparticles.
  • Closer nanoparticle proximity creates local hot spots, leading to a red shift in local surface plasmon resonance (LSPR) peaks.
  • Enhanced surface-enhanced Raman scattering (SERS) performance was observed due to the created hot spots.
  • The structural integrity and collective optical properties of the plasmonic vesicles remain stable across various conditions (pH, salt concentration, temperature) after heating above 35 °C.

Conclusions:

  • Temperature-responsive plasmonic vesicles offer a novel method for tuning nanoparticle assembly and plasmonic properties.
  • The ability to control nanoparticle spacing via temperature provides a pathway for designing advanced optical materials.
  • The robust nature of these plasmonic vesicles makes them suitable for diverse applications requiring stable optical responses.