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Thermal conductivity of defective graphene: an efficient molecular dynamics study based on graphics processing units
1Department of Engineering Mechanics, School of Civil Engineering and Transportation, South China University of Technology, Guangzhou, Guangdong Province 510640, People's Republic of China.
Nanotechnology
|February 8, 2020
Summary
Topological defects significantly reduce graphene
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Graphene exhibits exceptional thermal conductivity.
- Topological defects like vacancies and Stone-Wales defects can impair these properties.
- Understanding defect impact is crucial for graphene applications.
Purpose of the Study:
- To investigate the influence of topological defects on graphene's thermal conductivity.
- To compare the effects of single vacancies, double vacancies, and Stone-Wales defects.
- To analyze the impact of defect concentration and temperature.
Main Methods:
- Developed a program for constructing defective graphene models with tunable defect parameters.
- Employed efficient GPU-accelerated molecular dynamics for thermal conductivity calculations.
- Analyzed results from a phonon perspective.
Main Results:
- Topological defects considerably reduce graphene's thermal conductivity.
- The reduction in thermal conductivity lessens with increasing defect concentration.
- Stone-Wales defects have a less pronounced weakening effect compared to vacancies at similar concentrations.
- Temperature influences the thermal conductivity of defective graphene.
Conclusions:
- Defect engineering significantly impacts graphene's thermal transport.
- Stone-Wales defects are less detrimental to thermal conductivity than vacancies.
- Findings offer insights for thermal management strategies in graphene-based devices.
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