Related Experiment Video
Updated: May 30, 2026
05:28
Versatile Technique to Produce a Hierarchical Design in Nanoporous Gold
Published on: February 10, 2023
Domain boundary formation in helical multishell gold nanowires
1Department of Applied Mathematics and Physics, Tottori University, Tottori 680-8550, Japan. Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (CREST-JST), Japan.
Summary
This study reveals how helical multishell gold nanowires form. Non-helical structures transform into helical ones via atom defects at domain boundaries, explained by energy dynamics.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Multishell gold nanowires exhibit unique properties.
- Understanding their structural formation is crucial for applications.
Purpose of the Study:
- Investigate the formation mechanism of helical domain boundaries in multishell gold nanowires.
- Analyze the atomic and electronic processes driving this transformation.
Main Methods:
- Theoretical study using quantum mechanical molecular dynamics simulations.
- Employing a tight-binding form Hamiltonian for relaxation.
- Analysis of local electronic structure and defect formation.
Main Results:
- Observed transformation of non-helical to helical nanowires (>10 nm length).
- Identified atom pair defects at the domain boundary, originating from inner shells.
- Electronic structure analysis revealed competition between surface reconstruction energy gain and defect formation energy loss.
Conclusions:
- The formation of helical domain boundaries is driven by a balance of surface reconstruction and defect energetics.
- A simple energy scaling theory provides a general explanation for this phenomenon.
- Insights into nanowire self-assembly and defect engineering.
