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Updated: May 31, 2025

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

Published on: June 30, 2018

Electron Beam-Assisted Au Nanocrystal Shear and Rotation.

Jiajian Guan^1,2, Wuxin Yang², Weidong Zhang³

¹School of Chemical Sciences, University of Auckland, Auckland 1010, New Zealand.

|January 24, 2025

Summary

This summary is machine-generated.

Electron beam irradiation induces structural transitions in gold nanocrystals by creating a thermal spike. This process shifts the lattice from nonclose-packed to close-packed planes, enabling precise nanocrystal manipulation.

Keywords:

electron beam irradiation in situ observations nanocrystals structural transitions thermal spike effect

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Area of Science:

Materials Science
Nanotechnology
Solid-State Physics

Background:

Understanding beam-induced structural transitions is crucial for nanomaterial phase engineering.
In situ studies of these transitions are experimentally challenging.

Purpose of the Study:

To investigate metastable structural transitions in gold nanocrystals under electron beam irradiation.
To elucidate the mechanisms driving lattice changes and nanocrystal rotation.

Main Methods:

Utilized aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) for irradiation.
Employed electron energy loss spectroscopy (EELS) and the two-temperature model to estimate thermal spikes.

Main Results:

Observed a transition from nonclose-packed (311, 220) to close-packed (111) Au lattice planes.
Attributed the transition to shear strain gradients at grain boundaries, with a critical shear strain of ~0.2.
Demonstrated nonrandom lattice rotation driven by the thermal spike.

Conclusions:

Electron beam irradiation induces significant structural changes in gold nanocrystals via thermal spikes.
Shear strain at grain boundaries plays a critical role in phase transitions.
Provides insights for precise nanocrystal manipulation using beam-assisted techniques.