Magnetic Orientation and Magnetic Properties of a Single Carbon Nanotube

Abstract

Carbon nanotubes were suspended in carbon tetrachloride and placed in magnetic fields of <80.0 kOe at 310 K. Scanning electron microscopy showed that a single and free nanotube was oriented with the tube axis parallel to the fields. From the Boltzmann distribution of tube directions, the anisotropy of susceptibilities parallel (χ ∥ ) and perpendicular (χ ⊥ ) to the tube axis is estimated to be χ ∥ − χ ⊥ ∼ (9 ± 5) × 10 -6 emu per mole of carbon atoms (χ ⊥ < χ ∥ < 0).