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Controlling PbS nanocrystal aggregation in conducting polymers.

Jamie H Warner¹, Andrew A R Watt, Richard D Tilley

¹School of Chemical and Physical Sciences, MacDiarmid Institute of Advanced Materials and Nanotechnology, Victoria University of Wellington, PO Box 600, Wellington, New Zealand.

|September 7, 2010

Summary

This study demonstrates direct synthesis of lead sulfide (PbS) nanocrystals within poly(3-hexylthiophene-2,5-diyl) conducting polymer. Synthesis conditions allow control over PbS nanocrystal aggregation for tailored material properties.

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Area of Science:

Materials Science
Nanotechnology
Polymer Chemistry

Background:

Conducting polymers offer unique electronic properties for nanomaterial integration.
Lead sulfide (PbS) nanocrystals are crucial for optoelectronic applications.
Controlling nanocrystal dispersion within polymer matrices is challenging.

Purpose of the Study:

To develop a direct synthesis method for PbS nanocrystals within a conducting polymer matrix.
To characterize the structural and morphological properties of the synthesized PbS nanocrystals.
To investigate the influence of synthesis conditions on PbS nanocrystal aggregation.

Main Methods:

Direct synthesis of PbS nanocrystals in poly(3-hexylthiophene-2,5-diyl).
Transmission electron microscopy (TEM) for size, shape, and morphology analysis.

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Fast Fourier Transform (FFT) analysis and selected area electron diffraction (SAED) for crystal structure determination.

Main Results:

PbS nanocrystals synthesized were faceted and uniform with a mean size of 10 nm.
TEM and diffraction analyses confirmed the rock salt crystal structure of PbS.
Synthesis conditions were shown to effectively control the aggregation of PbS nanocrystals within the polymer.

Conclusions:

Direct synthesis offers a viable route for integrating PbS nanocrystals into conducting polymers.
Controlled aggregation is achievable by tuning synthesis parameters.
This method holds potential for creating advanced composite materials for electronic and optoelectronic devices.