title: Probing properties of boron alpha-tubes by Ab Initio calculations.
abstract: We investigate the properties of nanotubes obtained from recently described boron alpha-sheet, using density functional theory. Computations confirm their high stability and identify mechanical stiffness parameters. This allows one to further analyze the basic vibrations, including the radial breathing mode Raman frequency, fRBM = 210(nm/ d) cm (-1). Careful relaxation reveals the curvature-induced buckling of certain atoms off the original plane. This distortion changes the overlap of the orbitals near the Fermi level and opens up the gap in narrow tubes, rendering them semiconducting. Wider tubes with the diameter d greater, similar 1.7 nm retain original metallic character of the alpha-sheet. This combination of properties could make boron alpha-tubes (BT) an important material for electronic, bio- and chemical sensing, and optical applications.
authors: Department of Mechanical Engineering & Materials Science and Department of Chemistry, Rice University, Houston, Texas 77005, USA.
authors: Abhishek K
authors: AK
authors: Singh
authors: Arta
authors: A
authors: Sadrzadeh
authors: Boris I
authors: BI
authors: Yakobson
mesh_terms: D001895:Boron / Q000737:chemistry*; D003198:Computer Simulation; D046911:Macromolecular Substances / Q000737:chemistry; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size
chemical_list: D046911:Macromolecular Substances; D001895:Boron