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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

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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.