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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures

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Coalescence and interface diffusion in linear CdTe/CdSe/CdTe heterojunction nanorods.

Bonil Koo¹, Brian A Korgel

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

|July 12, 2008

Summary

Colloidal nanorods with cadmium telluride/cadmium selenide (CdTe/CdSe) heterojunctions were synthesized. Se-Te interdiffusion and nanorod coalescence were measured, with a viscous flow model providing reasonable predictions.

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Area of Science:

Materials Science
Nanotechnology
Chemical Engineering

Background:

Colloidal nanorods are crucial in nanomaterials.
Controlled synthesis of heterojunction nanorods is challenging.
Understanding interdiffusion and coalescence is key for material properties.

Purpose of the Study:

To synthesize colloidal nanorods with linear CdTe/CdSe/CdTe heterojunctions.
To investigate the Se-Te interdiffusion rates across heterojunctions.
To study nanorod coalescence and compare it with theoretical models.

Main Methods:

Sequential reactant injection for nanorod synthesis.
Nanobeam energy dispersive X-ray spectroscopy (EDS) for composition profiling.
Time-dependent measurements of interdiffusion and coalescence.

Main Results:

Successful synthesis of CdTe/CdSe/CdTe heterojunction nanorods.
Quantified Se-Te interdiffusion rates at different aging times.
Observed nanorod coalescence leading to decreased aspect ratios.
Viscous flow model showed good agreement with experimental coalescence rates.

Conclusions:

Sequential injection is effective for creating linear heterojunction nanorods.
Se-Te interdiffusion drives nanorod coalescence.
Continuum viscous flow models can predict nanorod coalescence behavior.