Double-wall nanotubes (DWNT) are an important sub-segment of MWNT.
These materials combine similar morphology and other properties of SWNT, while significantly improving their resistance to chemicals. This property is especially important when functionality is required to add new properties to the nanotube.
Since DWNT are a synthetic blend of both SWNT and MWNT, they exhibit the electrical and thermal stability of the latter and the flexibility of the former.
Because they are developed for highly specific applications, SWNT that have been functionalized are more susceptible to breakage. Creating any structural imperfections can modify their mechanical and electrical properties.
However, with DWNT, only the outer wall is modified, thereby preserving the intrinsic properties.
Also, research has shown that DWNT have better thermal and chemical stability than SWNT. DWNT can be applied to gas sensors and dielectrics, and to technically-demanding applications like field-emission displays, nanocomposite materials, and nanosensors.
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