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Pentagonal nanorods and nanoparticles with mismatched shell layers.

L M Dorogin¹, S Vlassov, A L Kolesnikova

¹Institute of Physics, University of Tartu 51014, Tartu, Estonia.

Journal of Nanoscience and Nanotechnology

|December 8, 2010

Summary

Pentagonal nanorods and nanoparticles can relax stress through a surface layer with crystal lattice mismatch. This mechanism is energetically favorable above a specific threshold radius for FCC metals.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Pentagonal nanorods and nanoparticles exhibit fivefold symmetry.
These nanomaterials possess inherent elastic strains and mechanical stresses.
Existing stress relaxation mechanisms may not fully address these unique structures.

Purpose of the Study:

To investigate a novel stress relaxation mechanism in pentagonal nanorods and nanoparticles.
To analyze the formation of a surface layer with crystal lattice mismatch as a stress relaxation pathway.
To determine the energetic favorability and critical dimensions for this relaxation mechanism.

Main Methods:

Theoretical and experimental investigation of pentagonal nanostructures.
Application of the disclination model to calculate elastic fields and energies.

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Determination of optimal mismatch parameters and threshold radii.

Main Results:

A new stress relaxation mechanism involving a mismatched surface layer was identified.
Elastic fields and energies were calculated for nanostructures with mismatched layers.
The optimal mismatch parameter for maximal energy release was determined.
Threshold radii for energetically favorable layer formation were found to be approximately 10 nm for nanoparticles and 100 nm for nanorods in FCC metals.

Conclusions:

The formation of a surface layer with crystal lattice mismatch provides an effective stress relaxation pathway for pentagonal nanostructures.
The disclination model successfully describes the elastic behavior and energy release associated with this mechanism.
The identified threshold radii offer critical insights into the size-dependent stability and behavior of these nanomaterials.