From brittle to ductile: a structure dependent ductility of diamond nanothread
Article
Article Title | From brittle to ductile: a structure dependent ductility of diamond nanothread |
---|---|
ERA Journal ID | 41997 |
Article Category | Article |
Authors | Zhan, Haifei (Author), Zhang, Gang (Author), Tan, Vincent B. C. (Author), Cheng, Yuan (Author), Bell, John M. (Author), Zhang, Yong-Wei (Author) and Gu, Yuantong (Author) |
Journal Title | Nanoscale |
Journal Citation | 8 (21), pp. 11177-11184 |
Number of Pages | 8 |
Year | 2016 |
Publisher | The Royal Society of Chemistry |
Place of Publication | United Kingdom |
ISSN | 2040-3364 |
2040-3372 | |
Digital Object Identifier (DOI) | https://doi.org/10.1039/c6nr02414a |
Abstract | As a potential building block for the next generation of devices/multifunctional materials that are spreading in almost every technology sector, one-dimensional (1D) carbon nanomaterial has received intensive research interests. Recently, a new ultra-thin diamond nanothread (DNT) has joined this palette, which is a 1D structure with poly-benzene sections connected by Stone-Wales (SW) transformation defects. Using large-scale molecular dynamics simulations, we found that this sp3 bonded DNT can transition from brittle to ductile behaviour by varying the length of the poly-benzene sections, suggesting that DNT possesses entirely different mechanical responses than other 1D carbon allotropes. Analogously, the SW defects behave like a grain boundary that interrupts the consistency of the poly-benzene sections. For a DNT with a fixed length, the yield strength fluctuates in the vicinity of a certain value and is independent of the 'grain size'. On the other hand, both yield strength and yield strain show a clear dependence on the total length of DNT, which is due to the fact that the failure of the DNT is dominated by the SW defects. Its highly tunable ductility together with its ultra-light density and high Young's modulus makes diamond nanothread ideal for the creation of extremely strong three-dimensional nano-architectures. |
Keywords | benzene; defects; ductility; elastic moduli; grain boundaries; molecular dynamics; yield stress |
ANZSRC Field of Research 2020 | 401807. Nanomaterials |
Byline Affiliations | Queensland University of Technology |
Institute of High Performance Computing, Singapore | |
National University of Singapore | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q5x4z/from-brittle-to-ductile-a-structure-dependent-ductility-of-diamond-nanothread
Download files
128
total views59
total downloads0
views this month0
downloads this month