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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Fabricating Nanogaps by Nanoskiving
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Particle-in-a-Frame Nanostructures with Interior Nanogaps.

Seunghoon Lee1, Jaeyoung Kim1, Hyunwoo Yang1

  • 1Center for Nanotectonics, Department of Chemistry and KI for the NanoCentury, KAIST, Daejeon, 34141, Korea.

Angewandte Chemie (International Ed. in English)
|September 5, 2019
PubMed
Summary

Researchers developed novel gold nanostructures with tiny internal gaps, mimicking the plasmonic properties of many particles in one. These "particle-in-a-frame" nanostructures show enhanced performance in sensing and spectroscopy due to confined electric fields.

Keywords:
SERSgoldnanoframesnanogapsplasmon

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Plasmonics

Background:

  • Exploiting plasmonic properties of nanoparticles often requires large ensembles.
  • Achieving single-nanoparticle control over plasmonic behavior is challenging.
  • Interior nanogaps in hollow colloids can concentrate plasmonic effects.

Purpose of the Study:

  • To develop a synthetic method for creating single plasmonic nanostructures with controllable interior nanogaps.
  • To investigate the plasmonic and sensing capabilities of these novel nanostructures.
  • To demonstrate the advantages of interior nanogaps for enhancing electric field confinement.

Main Methods:

  • Galvanic replacement reaction between silver nanoprisms and gold precursors.
  • Precise control over reaction conditions to engineer nanostructure morphology.
  • Characterization of nanostructure size, shape, and interior nanogap dimensions.
  • Evaluation of performance in plasmonic sensing and surface-enhanced Raman scattering (SERS).

Main Results:

  • Successful synthesis of gold particle-in-a-frame nanostructures with well-defined sub-2 nm interior nanogaps.
  • Demonstrated superior performance in plasmonic sensing and SERS compared to solid nanoparticles and nanoframe counterparts.
  • Attributed enhanced performance to the highly confined electric fields within the interior nanogaps (hot spots).

Conclusions:

  • The developed synthetic approach enables the creation of advanced plasmonic hollow colloids with tunable interior nanogaps.
  • These nanostructures offer a unique platform for single-nanoparticle plasmonic applications.
  • The interior hot spots significantly enhance electric field confinement, leading to improved sensing and SERS performance.