Phys. Rev. Lett. 89, 177401 (2002) [4 pages]Multiple Ionic-Plasmon Resonances in Naturally Occurring Multiwall Nanotubes: Infrared Spectra of Chrysotile AsbestosReceived 21 May 2002; published 4 October 2002 Chrysotile asbestos is formed by densely packed bundles of multiwall hollow nanotubes. Each wall in the nanotubes is a cylindrically wrapped layer of Mg3Si2O5(OH)4. We show by experiment and theory that the infrared spectra of chrysotile present multiple ionic-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. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.89.177401
DOI:
10.1103/PhysRevLett.89.177401
PACS:
78.67.Ch, 63.22.+m, 73.20.Mf, 91.60.–x
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