The pressure response of double-wall carbon nanotubes has been investigatedby means of Raman spectroscopy up to 10 GPa. The intensity of the radialbreathing modes of the outer tubes decreases rapidly but remain observable upto 9 GPa, exhibiting a behavior similar (but less pronounced) to that ofsingle-wall carbon nanotubes, which undergo a shape distortion at higherpressures. In addition, the tangential band of the external tubes broadens anddecreases in amplitude. The corresponding Raman features of the internal tubesappear to be considerably less sensitive to pressure. All findings lead to theconclusion that the outer tubes act as a protection shield for the inner tubeswhereas the latter increase the structural stability of the outer tubes uponpressure application.
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