Tensile Characterization of Single-Walled Carbon Nanotubes with Helical Structural Defects
| Autor: | Young In Jhon, Seok Lee, Woon Jo Cho, Chulki Kim, Minah Seo, Young Min Jhon |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Work (thermodynamics)
Multidisciplinary Materials science 02 engineering and technology Carbon nanotube Growth model 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences Characterization (materials science) law.invention Molecular dynamics law Chemical physics Ultimate tensile strength 0210 nano-technology Linear elastic fracture mechanics Chirality (chemistry) |
| Zdroj: | Scientific Reports SCIENTIFIC REPORTS(6) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/srep20324 |
| Popis: | Recently, evidence was presented that certain single-walled carbon nanotubes (SWNTs) possess helical defective traces, exhibiting distinct cleaved lines, yet their mechanical characterization remains a challenge. On the basis of the spiral growth model of SWNTs, here we present atomic details of helical defects and investigate how the tensile behaviors of SWNTs change with their presence using molecular dynamics simulations. SWNTs have exhibited substantially lower tensile strength and strain than theoretical results obtained from a seamless tubular structure, whose physical origin cannot be explained either by any known SWNT defects so far. We find that this long-lasting puzzle could be explained by assuming helical defects in SWNTs, exhibiting excellent agreement with experimental observation. The mechanism of this tensile process is elucidated by analyzing atomic stress distribution and evolution and the effects of the chirality and diameter of SWNTs on this phenomenon are examined based on linear elastic fracture mechanics. This work contributes significantly to our understanding of the growth mechanism, defect hierarchies and mechanical properties of SWNTs. |
| Databáze: | OpenAIRE |
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