Structure of twisted BNC nanotubes with polygonal cross‐section
Abstract:BNC nanotubes and nanofibers have been synthesized in the high isostatic pressure apparatus in Ar at 1923 K and 1.5 MPa in the presence of yttrium aluminium garnet. Some of the nanotubes obtained were filled with Al2O3. Transmission electron microscopy (TEM) studies have shown that the nanotubes and nanofibers have a polygonal cross‐section (prismatic shape), and most often they are twisted, which is due to the transversal instability of the nanotubes originating under the growth conditions, including temperature treatment. Twisting also revealed itself in the appearance of the moiré fringes during the TEM observation of some of the nanotubes and nanofibers. Analysis of these fringes has shown that the facets of these nanotubes represent the slightly misoriented hexagonal BN and/or C plates. An Al2O3 filling of the nanotube makes it harder to twist when subjected to torque, which conforms to the tube deformation theory.
Document Type: Research Article
Affiliations: Technological Institute for Superhard and Novel Carbon Materials (TISNCM), 7a Centralnaya str., Troitsk, 142190 Moscow region, Russian Federation
Publication date: 2012-10-01