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Park, Kibog
Emergent Materials & Devices Lab
Research Interests
  • Semiconductor, Metal Oxide Thin Film, Graphene, Non-Volatile Memory, Quantum Transport, Quantum Computing Device

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Negative Poisson's ratios in metal nanoplates

Cited 9 times inthomson ciCited 8 times inthomson ci
Title
Negative Poisson's ratios in metal nanoplates
Author
Ho, Duc TamPark, Soon-DongKwon, Soon-YongPark, KibogKim, Sung Youb
Issue Date
2014-02
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.5, pp.3255
Abstract
The Poisson's ratio is a fundamental measure of the elastic-deformation behaviour of materials. Although negative Poisson's ratios are theoretically possible, they were believed to be rare in nature. In particular, while some studies have focused on finding or producing materials with a negative Poisson's ratio in bulk form, there has been no such study for nanoscale materials. Here we provide numerical and theoretical evidence that negative Poisson's ratios are found in several nanoscale metal plates under finite strains. Furthermore, under the same conditions of crystal orientation and loading direction, materials with a positive Poisson's ratio in bulk form can display a negative Poisson's ratio when the material's thickness approaches the nanometer scale. We show that this behaviour originates from a unique surface effect that induces a finite compressive stress inside the nanoplates, and from a phase transformation that causes the Poisson's ratio to depend strongly on the amount of stretch.
URI
https://scholarworks.unist.ac.kr/handle/201301/10053
URL
https://www.nature.com/articles/ncomms4255
DOI
10.1038/ncomms4255
ISSN
2041-1723
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