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Optically anisotropic polyethylene-gold nanocomposites.

Y Dirix¹, C Darribère, W Heffels

¹Department of Materials, Institute of Polymers, Eidgenössische Technische Hochshule Zürich, CH-8092 Zürich, Switzerland.

|March 8, 2008

Summary

Gold nanoparticles in polyethylene create color-changing materials. These polymer-inorganic nanocomposites act as tunable color polarizing filters, changing appearance with light polarization.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Self-assembled monolayers of alkanethiols can functionalize gold nanoparticles.
Polymer-inorganic nanocomposites offer unique optical properties.
Uniaxial drawing is a method for orienting nanostructures within polymer matrices.

Purpose of the Study:

To investigate the optical properties of gold nanoparticle-polymer nanocomposites.
To explore the potential of these materials as polarizing filters.
To correlate optical anisotropy with nanoparticle morphology.

Main Methods:

Solution-casting of gold colloids within a polyethylene matrix.
Uniaxial drawing of the nanocomposite in the solid state.
Spectroscopic analysis of light absorption with varying polarization.

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Main Results:

The absorption spectra showed strong dependence on light polarization direction.
Materials exhibited red or blue hues based on polarization relative to the drawing axis.
Transmission electron microscopy revealed uniaxially oriented, high-aspect-ratio nanoparticle arrays.

Conclusions:

The observed optical anisotropy arises from oriented nanoparticle morphology.
Polymer-inorganic nanocomposites can function as effective color polarizing filters.
These materials offer tunable optical filtering capabilities.