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Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Colloids and Suspensions

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Related Experiment Video

Updated: Feb 10, 2026

Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation

Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation

Published on: August 15, 2019

Colloidal luminescent silicon nanorods.

Xiaotang Lu¹, Colin M Hessel, Yixuan Yu

¹Department of Chemical Engineering, Texas Materials Institute, and Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , Austin, Texas 78712-1062, United States.

|June 5, 2013

Summary

This summary is machine-generated.

Researchers developed silicon nanorods using tin nanocrystals and dodecylamine. Post-etching and hydrosilylation treatment enabled bright photoluminescence, with ligands preventing surface oxidation for extended storage.

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Area of Science:

Materials Science
Nanotechnology
Semiconductor Physics

Background:

Silicon nanorods are crucial for optoelectronic applications.
Controlling silicon nanorod synthesis and surface properties remains challenging.
Achieving stable, luminescent silicon nanostructures is a key research goal.

Purpose of the Study:

To develop a method for synthesizing luminescent silicon nanorods.
To investigate the role of tin and dodecylamine in nanorod formation.
To enhance the photoluminescence properties and stability of silicon nanorods.

Main Methods:

Silicon nanorods were grown via trisilane decomposition in squalane, using tin nanocrystals and dodecylamine.
The solution-liquid-solid growth mechanism was employed, facilitated by tin.
Post-synthesis treatments included hydrofluoric acid etching and thermal hydrosilylation with 1-octadecene.

Main Results:

Tin nanocrystals and dodecylamine enabled controlled silicon nanorod growth.
As-synthesized nanorods lacked luminescence.
Etching and hydrosilylation resulted in bright photoluminescence with 4-5% quantum yields.
Dodecylamine ligands provided surface oxidation protection for months.

Conclusions:

A viable method for producing luminescent silicon nanorods was established.
Surface passivation using hydrosilylation is effective for achieving bright photoluminescence.
The employed ligands offer significant protection against surface oxidation, enhancing material stability.