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Related Experiment Video

Updated: May 2, 2026

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles

Published on: March 2, 2016

Colloidal synthesis of gold semishells.

Denis Rodríguez-Fernández¹, Jorge Pérez-Juste¹, Isabel Pastoriza-Santos¹

¹Departamento de Química Física, Universidade de Vigo 36310 Vigo (Spain)

|February 20, 2014

Summary

Researchers developed a scalable colloid chemistry method to create tunable gold semishells using Janus silica particles. This technique allows for the fabrication of hollow gold structures with unique optical properties.

Keywords:

Janus particles asymmetric syntheses colloids semishells

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Area of Science:

Colloid chemistry
Nanomaterials science
Optical physics

Background:

Fabricating precisely shaped metallic nanostructures is crucial for advanced optical applications.
Janus particles offer unique platforms for anisotropic material growth.
Controlling morphology influences the optical properties of plasmonic nanoparticles.

Purpose of the Study:

To present a novel and scalable colloid chemistry strategy for fabricating gold semishells.
To investigate the influence of Janus particle geometry on gold semishell morphology.
To explore the optical properties of these gold semishells and their dependence on size.

Main Methods:

Utilizing Janus silica particles (500 nm) functionalized with amino groups for selective gold deposition.
Employing a scalable colloid chemistry approach for controlled gold growth.
Characterizing optical properties using visible near-infrared (vis-NIR) spectroscopy.
Performing boundary element method (BEM) simulations for optical analysis.
Etching silica cores with hydrofluoric acid to create hollow gold semishells.

Main Results:

Successfully fabricated gold semishells with tunable morphology by controlling Janus particle geometry.
Demonstrated a route to produce hollow gold semishells.
Vis-NIR spectroscopy revealed distinct optical features.
Optical properties were influenced by the large core size, shifting main features beyond the near-infrared region.

Conclusions:

The developed colloid chemistry strategy is effective for scalable fabrication of gold semishells.
Janus particle geometry is a key factor in tuning semishell morphology and optical properties.
The large size of the fabricated structures leads to optical responses primarily in the longer wavelength regions.