What are the intermolecular forces that can be found in Carbon Nanotubes?
There is known, but poorly understood $\pi-\pi$ stacking. While weak compared to covalent, dipole or ionic interactions, it still beats usual van-der-vaals interactions.
Carbon nanotubes are, essentially, polycondensed aromatical systems, so they can and would interact with each other as aromatic systems via $\pi-\pi$ stacking
Carbon nanotubes are not polar or ionic. Therefore I do not expect any ion or dipole intermolecular interactions. Since carbon has electrons, that only leaves us with dispersion forces (induced-dipole). Therefore carbon nanotubes exhibit dispersion as the only intermolecular force.