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Related Experiment Video

Updated: Jun 26, 2025

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics
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Embedding plasmonic nanoparticles in soft crystals: an approach exploiting CTAB-I structures.

Navyashree Vasudeva1, Annie Jayasing1, Kishorkumar Sindogi1

  • 1Solid State and Structural Chemistry Unit, Indian Institute of Science, CV Raman Road Bengaluru 560012 India anshup@iisc.ac.in.

Nanoscale Advances
|May 16, 2024
PubMed
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Researchers embedded bimetallic plasmonic nanoparticles into cetyltrimethylammonium bromide-iodide crystals, creating a novel triclinic polymorph. This new structure facilitates strong interparticle plasmonic coupling for advanced material applications.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Embedding functional nanoparticles into soft substrates creates multifunctional materials.
  • Cetyltrimethylammonium bromide-iodide (CTAB) is a soft crystal substrate.

Purpose of the Study:

  • To incorporate bimetallic plasmonic nanoparticles into CTAB crystals.
  • To investigate the resulting crystal structure and properties.
  • To develop a method for high-density nanoparticle incorporation.

Main Methods:

  • Synthesis of CTAB-iodide crystals with embedded bimetallic nanoparticles.
  • X-ray diffraction for crystal structure analysis.
  • Solid-state nuclear magnetic resonance (NMR) for molecular dynamics.
  • Light scattering measurements for solution phase dynamics.

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Main Results:

  • A novel, symmetry-lowered triclinic cetrimonium crystal polymorph emerged.
  • Strong interparticle plasmonic coupling was observed.
  • Enhanced cetrimonium chain rigidity and reduced methyl group mobility were detected due to iodide incorporation.
  • Gold nanosphere markers showed aggregation in solution.
  • A two-step synthesis achieved high incorporation levels (533 particles/μm²).

Conclusions:

  • The novel triclinic polymorph enables strong plasmonic coupling.
  • Iodide incorporation alters CTAB molecular dynamics.
  • A viable method for high-density nanoparticle integration into soft crystals was developed.