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Updated: Dec 26, 2025

Colloidal Synthesis of Nanopatch Antennas for Applications in Plasmonics and Nanophotonics

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Published on: May 28, 2016

Morphological Transitions in Patchy Nanoparticles.

Elizabeth Galati¹, Huachen Tao¹, Christian Rossner^1,2

¹Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

|March 17, 2020

Summary

This summary is machine-generated.

Patchy nanoparticles (NPs) with multiple surface patches remain stable at 40°C but lose patches at 80°C due to ligand mobility. This study reveals temperature limits for using these advanced nanomaterials.

Keywords:

gold−thiol bond nanoparticles nanopatterning patches polymer ligands

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Last Updated: Dec 26, 2025

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Area of Science:

Colloid and Surface Science
Materials Science
Nanotechnology

Background:

Patchy nanoparticles (NPs) are crucial for creating functional hierarchical materials.
Generating NPs with distinct surface patches is typically achieved via polymer ligand segregation into micelles.
The thermodynamic stability of multiple patches on NP surfaces is a key concern.

Purpose of the Study:

To investigate the temperature-dependent stability of patchy gold nanoparticles (AuNPs) with multiple surface patches.
To determine the conditions under which patchy NP morphology is maintained or lost.
To provide insights into the surface science of patchy nanocolloids for application guidance.

Main Methods:

Synthesis of gold nanoparticles end-grafted with thiol-terminated polymer ligands.
Experimental observation of patchy surface morphology under varying temperature conditions.
Theoretical rationalization using a scaling approach.

Main Results:

Patchy NP surface morphology is preserved up to 40°C, with changes in patch shape over time.
At 80°C, the number of patches per NP decreases significantly.
Loss of patches at higher temperatures is attributed to increased ligand mobility, patch coalescence, and ligand desorption.

Conclusions:

The stability of multiple surface patches on NPs is temperature-dependent.
Strong thiol grafting to the NP surface maintains patchy morphology below 40°C.
Understanding these temperature limits is crucial for the effective application of patchy NPs.