Raman spectroscopy on carbon nanotubes at high pressure
I. Loa
TL;DR
This review discusses how Raman spectroscopy reveals pressure-induced changes in the structure and dynamics of carbon nanotubes, including reversible effects, irreversible transformations, and potential phase transitions to superhard materials.
Contribution
It provides a comprehensive overview of high-pressure effects on carbon nanotubes using Raman spectroscopy, highlighting structural distortions and transformation attempts.
Findings
Reversible pressure effects on lattice dynamics
Irreversible structural transformations at high pressure
Potential pathways for transforming nanotubes into superhard phases
Abstract
Raman spectroscopy has been the most extensively employed method to study carbon nanotubes at high pressures. This review covers reversible pressure-induced changes of the lattice dynamics and structure of single- and multi-wall carbon nanotubes as well as irreversible transformations induced by high pressures. The interplay of covalent and van-der-Waals bonding in single-wall nanotube bundles and a structural distortion near 2 GPa are discussed in detail. Attempts of transforming carbon nanotubes into diamond and other "superhard" phases are reviewed critically.
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