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Structural Analysis of Collapsed, and Twisted and Collapsed, Multiwalled Carbon Nanotubes by Atomic Force Microscopy
Yu1, Kowalewski, Ruoff
1Department of Physics, Washington University in St. Louis, St. Louis, Missouri 63130.
Physical Review Letters
|January 3, 2001
Summary
Multiwalled carbon nanotubes (MWCNTs) showed remarkable radial flexibility upon surface interaction, leading to significant collapse and deformation. This contrasts sharply with their known high axial rigidity, revealing new insights into nanotube mechanical properties.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Carbon nanotubes possess exceptional mechanical properties, including high axial rigidity.
- Understanding the behavior of carbon nanotubes under various environmental conditions is crucial for their application.
Purpose of the Study:
- To investigate the radial deformation and collapse behavior of multiwalled carbon nanotubes (MWCNTs) when interacting with surfaces.
- To compare the flexibility of collapsed and uncollapsed sections of MWCNTs.
Main Methods:
- Tapping-mode atomic force microscopy was employed to observe MWCNT morphology.
- In-situ monitoring over a one-month period tracked changes in MWCNT structure.
Main Results:
- A section of MWCNT1 and another twisted MWCNT were observed to be fully collapsed.
- The collapsed section of MWCNT1 exhibited significantly greater flexibility, advancing 120 nm in one month.
- Surface interactions, potentially including a water meniscus, were identified as likely initiators of the collapse.
Conclusions:
- MWCNTs can undergo substantial radial deformation, challenging the notion of their uniform rigidity.
- Surface interactions play a critical role in dictating the mechanical behavior and structural integrity of MWCNTs.
- The observed radial flexibility contrasts with their inherent high axial rigidity, opening new avenues for nanotube applications.