Multiple plasmon resonances in naturally-occurring multiwall nanotubes: infrared spectra of chrysotile asbestos
Etienne Balan, Francesco Mauri, Celine Lemaire, Christian Brouder,, Francois Guyot, A. Marco Saitta, Bertrand Devouard
TL;DR
This study reveals that chrysotile asbestos's infrared spectra exhibit multiple plasmon resonances due to collective charge excitations in its multiwall nanotube structure, combining experimental and theoretical analysis.
Contribution
The paper demonstrates the presence of multiple plasmon resonances in chrysotile asbestos's infrared spectra, linking them to the nanotube's cylindrical wrapping of anisotropic material.
Findings
Multiple plasmon resonances observed in infrared spectra.
Resonances are due to collective charge excitations in nanotubes.
Resonance features depend on resonance width and nanotube structure.
Abstract
Chrysotile asbestos is formed by densely packed bundles of multiwall hollow nanotubes. Each wall in the nanotubes is a cylindrically wrapped layer of . We show by experiment and theory that the infrared spectrum of chrysotile presents multiple plasmon resonances in the Si-O stretching bands. These collective charge excitations are universal features of the nanotubes that are obtained by cylindrically wrapping an anisotropic material. The multiple plasmons can be observed if the width of the resonances is sufficiently small as in chrysotile.
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