Table 2 The physical properties of carbon nanotubes

Equilibrium structure

Average diameter of SWNTs

1.2 to 1.4 nm

Distance from opposite carbon atoms (line 1)

2.83 Å

Analogous carbon atom separation (line 2)

2.456 Å

Parallel carbon bond separation (line 3)

2.45 Å

Carbon bond length (line 4)

1.42 Å

C-C tight bonding overlap energy

Approximately 2.5 eV

Group symmetry (10, 10)

C5V

Lattice: bundles of ropes of nanotubes

Triangular lattice (2D)

Lattice constant

17 Å

 Lattice parameter

(10, 10) Armchair

16.78 Å

(17, 0) Zigzag

16.52 Å

(12, 6) Chiral

16.52 Å

 Density

(10, 10) Armchair

1.33 g/cm³

(17, 0) Zigzag

1.34 g/cm³

(12, 6) Chiral

1.40 g/cm³

 Interlayer spacing:

(n, n) Armchair

3.38 Å

(n, 0) Zigzag

3.41 Å

(2n, n) Chiral

3.39 Å

Optical properties

 Fundamental gap

For (n, m); n − m is divisible by 3 [metallic]

0 eV

For (n, m); n − m is not divisible by 3 [semiconducting]

Approximately 0.5 eV

Electrical transport

Conductance quantization

(12.9 k O )-1

Resistivity

10-4 O -cm

Maximum current density

1,013 A/m²

Thermal transport

Thermal conductivity

Approximately 2,000 W/m/K

Phonon mean free path

Approximately 100 nm

Relaxation time

Approximately 10 to 11 s

Elastic behavior

Young's modulus (SWNT)

Approximately 1 TPa

Young's modulus (MWNT)

1.28 TPa

Maximum tensile strength

Approximately 100 GPa