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Toward hyperuniform disordered plasmonic nanostructures for reproducible surface-enhanced Raman spectroscopy.

C De Rosa1, F Auriemma, C Diletto

  • 1Dipartimento di Scienze Chimiche, Università di Napoli Federico II, Complesso Monte S. Angelo, Via Cintia 80126, Napoli, Italy.

Physical Chemistry Chemical Physics : PCCP
|March 3, 2015
PubMed
Summary
This summary is machine-generated.

We developed a method to self-assemble gold nanoparticle (Au-NP) clusters using block-copolymers (BCP). This technique creates highly reproducible Surface-Enhanced Raman Scattering (SERS) patterns over large areas.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Plasmonics

Background:

  • Block-copolymers (BCP) self-assemble into ordered nanostructures.
  • Gold nanoparticles (Au-NPs) exhibit unique plasmonic properties.
  • Surface-Enhanced Raman Scattering (SERS) requires precise nanostructure design.

Purpose of the Study:

  • To control the self-assembly of gold nanoparticle (Au-NP) clusters using block-copolymers (BCP).
  • To investigate the impact of BCP morphology on Au-NP clustering and SERS performance.
  • To explore electric field modulation of BCP-directed Au-NP assemblies.

Main Methods:

  • Utilized phase separation of poly(styrene)-b-poly(methylmethacrylate) (PS-b-PMMA) BCP on indium tin oxide coated glass.
  • Directed Au-NP (4 nm) inclusion into PS-nanodomains via thermal annealing after gold evaporation.
  • Applied static electric fields to modulate BCP morphology and Au-NP cluster arrangement.

Main Results:

  • Achieved dense clustering of Au-NPs (> 10(4) μm(2)) in a 2D pattern with near-hyperuniform correlations.
  • Demonstrated highly reproducible SERS enhancement (std. dev. ~10% over 0.25 cm(2)) due to homogeneous plasmonic patterns.
  • Observed electric field-induced alignment of Au-NP clusters into linear chains, enhancing SERS activity but reducing reproducibility.

Conclusions:

  • BCP self-assembly provides a robust platform for creating homogeneous, large-area plasmonic nanostructures.
  • The resulting Au-NP clusters yield highly reproducible SERS enhancement.
  • Electric field control offers a pathway to tune SERS activity and spatial uniformity.