Single‐Crystalline AlN Nanotubes with Carbon‐Layer Coatings on the Outer and Inner Surfaces via a Multiwalled‐Carbon‐Nanotube‐Template‐Induced Route

Wurtzite-type single-crystalline AlN nanotubes with carbon coatings on the outer and inner surfaces (see Figure) were synthesized in bulk quantities through a substitution carbonitridation chemical process using multiwalled carbon nanotubes as templates. The AlN nanotubes are approximately several micrometers in length, with 45–50 nm diameters and 13 nm-thick walls, and have potential as high-temperature electronic or optoelectronic devices and as field emitters.