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Table 2 The physical properties of carbon nanotubes

From: Carbon nanotubes: properties, synthesis, purification, and medical applications

Physical properties Values
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