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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
Published on: April 28, 2016
Double-walled carbon nanotubes under hydrostatic pressure: Raman experiments and simulations
Vikram Gadagkar1, Surajit Saha, D V S Muthu
1Department of Physics, Indian Institute of Science, Bangalore 560012, India.
Journal of Nanoscience and Nanotechnology
|July 28, 2007
Summary
Hydrostatic pressure affects double-walled carbon nanotubes (DWNTs). Polymer presence increases tangential mode frequency changes, while collapse pressure scales with radius cubed for both single (SWNT) and DWNT bundles.
Area of Science:
- Materials Science
- Nanotechnology
- Condensed Matter Physics
Background:
- Carbon nanotubes (CNTs) exhibit unique mechanical properties.
- Understanding their behavior under pressure is crucial for applications.
Purpose of the Study:
- Investigate the impact of hydrostatic pressure on double-walled carbon nanotubes (DWNTs).
- Characterize the collapse behavior of single-walled (SWNT) and DWNT bundles.
- Determine the relationship between collapse pressure and nanotube radius.
Main Methods:
- Raman spectroscopy to analyze vibrational modes under pressure.
- Classical molecular dynamics simulations to model nanotube bundle collapse.
- Varying hydrostatic pressure and nanotube radii in simulations.
Main Results:
- Tangential mode frequency changes more rapidly with pressure in polymer-doped DWNTs.
- Collapse pressure (pc) for SWNT and DWNT bundles scales with 1/R^3.
- DWNT bundles exhibit ~30% hysteresis upon decompression, with lattice restoration.
Conclusions:
- DWNT bundle collapse pressure approximates the sum of individual tube collapse pressures.
- Inner tubes provide support to outer tubes in DWNTs.
- Effective bending stiffness of DWNTs is related to individual SWNT stiffnesses.
