Graphene

Carbon nanotube

Fullerene

Graphite

Dimensions

2

1

0

3

Hybridization

sp2

Mostly sp2

Mostly sp2

sp2

Hardness

Highest (for single layer)

High

High

High

Tenacity

Flexible, elastic

Flexible, elastic

Elastic

Flexible, non-elastic

Experimental Specific surface area (m2·g–1)

~1500

~1300

80 - 90

~10 - 20

Electrical conductivity (S·cm–1)

~2000

Structure- dependent

10–10

Anisotropic: 2 - 3 × 104*, 6†

Thermal conductivity (W·m–1·K–1)

4840 - 5300

3500

0.4

Anisotropic: 1500 - 2000*, 5 - 10†