title: Single-walled BN nanostructures.
abstract: We describe in situ synthesis and characterization of single-walled BN nanotubes terminated by fullerenelike structures using electron-cyclotron resonance nitrogen and electron beam boron sources onto polycrystalline tungsten substrates. Detailed comparisons of experimental high-resolution electron microscopy images and simulations based upon molecular models show a dominance of kinks and bends involving fourfold and eightfold ring structures as against fivefold or sevenfold which have been found with carbon. Analysis of the structures as a function of film thickness indicates that they are growing by addition of atoms to the exposed ends of single sheets, not at the substrate-nanostructure interface.
authors: Northwestern University, Department of Materials Science and Engineering, Evanston, Illinois 60208, USA.
authors: E
authors: E
authors: Bengu
authors: L D
authors: LD
authors: Marks