Tensile Characterization of Single- Walled Carbon Nanotubes with Helical Structural Defects

Title
Tensile Characterization of Single- Walled Carbon Nanotubes with Helical Structural Defects
Authors
전영인김철기서민아조운조이석전영민
Keywords
structural defect; carbon nanotube
Issue Date
2016-02
Publisher
Scientific Reports
Citation
VOL 6, NO 20324, 1-7
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/58589
ISSN
20452322
Appears in Collections:
KIST Publication > Article
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