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Updated: May 1, 2026

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

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Published on: September 27, 2011

Plasmon interactions between gold nanoparticles in aqueous solution with controlled spatial separation.

Iuliana E Sendroiu¹, Stijn F L Mertens, David J Schiffrin

¹Centre for Nanoscale Science, Chemistry Department, University of Liverpool, Liverpool, UKL69 7ZD.

Physical Chemistry Chemical Physics : PCCP

|April 25, 2006

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Gold nanocrystal aggregates show UV-visible spectra sensitive to interparticle distance up to 8 nm. Ligand length controls this separation, enabling applications like distance-sensitive labels and tunable nanomaterials.

Area of Science:

Nanotechnology
Materials Science
Spectroscopy

Background:

Gold nanocrystals exhibit unique optical properties dependent on their size, shape, and aggregation state.
Surface functionalization of nanoparticles allows for controlled assembly and tuning of their collective optical behavior.

Purpose of the Study:

To investigate the influence of interparticle distance on the UV-visible absorption spectra of gold nanocrystal aggregates.
To establish a method for controlling interparticle separation using functional ligands for tailored optical properties.

Main Methods:

Synthesis of gold nanocrystal aggregates in aqueous solution via ion-templated chelation.
Functionalization of gold nanoparticles with omega-mercaptocarboxylic acid ligands of varying chain lengths.

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Analysis of UV-visible absorption spectra to correlate spectral features with interparticle distances.

Main Results:

UV-visible spectra of gold nanocrystal aggregates display a single-particle band and an aggregate-associated band at higher wavelengths.
The position of the aggregate band is dependent on interparticle separation up to approximately 8 nm.
Tunable optical properties of nanostructured materials were achieved by varying ligand chain length.

Conclusions:

Interparticle distance is a critical factor influencing the optical properties of gold nanocrystal aggregates.
The developed method allows for the creation of distance-sensitive labels and proximity probes.
This approach enables the fabrication of nanostructured materials with precisely controlled optical characteristics.