Nitrogen Doping in Carbon Nanotube Systems

Nitrogen doping of carbon nanotubes (CNTs) has emerged as a versatile strategy to tailor the electronic, chemical and mechanical characteristics of these one-dimensional nanostructures. By substituting carbon atoms in the tubular graphene lattice with nitrogen, distinct bonding configurations—commonly classified as pyridinic, pyrrolic and graphitic—are introduced, each imparting unique charge distribution and defect states. These modifications can transform inherently metallic or semiconducting CNTs into materials with enhanced conductivity, tunable bandgaps and increased active sites for chemical interaction. Synthetic approaches span chemical vapour deposition using nitrogen-containing precursors, post-synthesis annealing in ammonia or organic nitriles, and solution-based functionalisation. Control over reaction temperature, precursor flow and catalyst composition enables precise regulation of nitrogen content and bonding motifs. Nitrogen-doped CNTs have been leveraged across a spectrum of applications: as metal-free electrocatalysts for oxygen reduction in fuel cells, as high-capacity conductive additives in lithium-ion and sodium-ion batteries, and as sensitive transducers in gas sensors. Beyond energy conversion and storage, their enhanced surface wettability and chemical reactivity also facilitate anchoring of nanoparticles for composite materials. Globally, such developments promise more sustainable and cost-effective technologies by reducing reliance on precious metals and by improving device lifetimes through structural robustness.

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Technical terms

Carbon nanotube (CNT): Cylindrical nanostructure of rolled graphene layers, exhibiting high aspect ratio and tunable electronic properties.

Nitrogen doping: Introduction of nitrogen atoms into the carbon lattice to create defect sites and modify electronic behaviour.

Chemical vapour deposition (CVD): A gas-phase synthesis method in which volatile precursors decompose on a heated substrate to form solid nanostructures.

Pyridinic nitrogen: Nitrogen atom bonded to two carbon atoms at the edge of a graphene layer, contributing one p-electron to the π system.

Graphitic nitrogen: Nitrogen atom substituting a carbon atom within the graphene plane, bonding to three carbon neighbours and donating electrons to the π network.

Electrocatalysis: Acceleration of electrochemical reactions at electrode surfaces, often relying on surface active sites and charge transfer kinetics.

References

1. Nitrogen Doped Carbon Nanotubes from Organometallic Compounds: A Review. Materials (2010).
2. Heteroatom-Doped Metal-Free Carbon Nanomaterials as Potential Electrocatalysts. Molecules (2022).
3. CVD-Synthesis of N-CNT Using Propane and Ammonia. Materials (2022).
4. Electrochemical Performance and Conductivity of N-Doped Carbon Nanotubes Annealed under Various Temperatures as Cathode for Lithium-Ion Batteries. Metals (2022).