Carbon Nanotubes (CNT)
Carbon nanotubes (CNTs) are cylindrical graphene nanostructures used as conductive additives and experimental structural reinforcements. This entry covers structural/functional CNT materials — not Vantablack or decorative ultra-black coatings.
Overview
Carbon nanotubes are seamless cylinders of sp2 carbon available as single-wall (SWCNT) and multi-wall (MWCNT) grades. In automotive R&D and early production, MWCNTs primarily serve as conductive additives in battery electrodes, EMI coatings and antistatic polymers at low weight loadings. Structural CNT composites remain largely experimental: translating nano-scale strength into macro laminates requires alignment, dispersion and interfacial chemistry that are still maturing for high-volume BIW. CNTs also appear in thermal interface materials and multifunctional adhesives. This record deliberately excludes Vantablack-type ultra-black optical coatings and focuses on structural and functional CNT materials for mobility. Handling dry CNT powders requires industrial hygiene controls due to inhalation concerns.
Automotive Applications
Similar Materials
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Battery Anode Material
Silicon and silicon-graphite composite anode materials that raise lithium-ion specific capacity beyond graphite limits. Used in progressive EV cell designs but challenged by volume expansion, SEI growth and cycle-life trade-offs.
Boron Nitride
Technical Ceramic
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Brass / Copper Alloys
Copper Alloy
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ETFE / FEP / PFA
Fluoropolymer
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Properties
Category
Type
Advanced Carbon Nanomaterial
Available Colors
Available Forms
Key Properties
- Exceptional specific strength and stiffness (individual tubes)
- High electrical and thermal conductivity
- High aspect ratio for percolation at low loading
- Dispersion and interfacial bonding challenge in matrices
- SWCNT vs MWCNT cost/performance trade-offs
- Occupational inhalation controls required for powders
Technical Specifications
Density
~1.3–1.4 g/cm³ (bulk CNT assemblies vary; true carbon density higher)
Tensile Strength
Individual CNTs theoretically multi-GPa; practical composites far lower and highly process-dependent
Temperature Resistance
Carbon structure stable to very high temperatures in inert atmosphere; polymer matrix usually limits composite use
Sustainability
Sustainability Rating
CVD synthesis of CNTs is energy- and catalyst-intensive. End-of-life recovery from composites is immature. Low loadings for conductivity can reduce other conductive fillers. Worker exposure controls are mandatory for powder forms.