A Two-Stage Route to Coaxial Cubic-Aluminum-Nitride–Boron- Nitride Composite Nanotubes



Coaxial cubic-aluminum-nitride–boron-nitride composite nanotubes have been synthesized via a template-free and catalyst-free two-stage route. The synthesized nanotubes have a uniform outer diameter of 50 nm and wall thickness of 15 nm, with a 2–3 nm thick BN coating. A vapor–solid (VS) mechanism is proposed for their growth, and insight is provided into the atomistic mechanism of coaxial nanotube growth.