B. Renker

Single-wall carbon nanotubes with diameters approaching 6 nm obtained by laser vaporization

Abstract Single-wall carbon nanotubes (SWNTs) with large diameters from 2 to 5.6 nm were prepared by pulsed laser vaporization of carbon rods doped with Co, Ni and FeS in an atmosphere of Ar:H2. The SWNT material was characterized by SEM, HRTEM, Raman, IR, UV–VIS–NIR absorption spectroscopy and thermogravimetric analysis.

FTIR-luminescence mapping of dispersed single-walled carbon nanotubes

We have applied the FTIR-luminescence/FT-Raman technique to map the near-infrared photoluminescence?(PL) of water?surfactant dispersions of single-walled carbon nanotubes (SWNTs) in broad excitation (250?1500?nm) and emission (800?1700?nm) ranges. The excitation wavelength was scanned by using the monochromatized light of standard xenon and tungsten halogen lamps. The PL maps are presented for SWNTs with a mean diameter of ~1.3?nm prepared by the pulsed laser vaporization method. When dispersed by powerful ultrasonic agitation and separated by ultracentrifugation, these nanotubes show structured absorption bands and a PL quantum yield as high as ~10-3. This indicates a large fraction of individual nanotubes in the dispersion. Electronic interband transition energies of nanotubes derived from the PL data correspond reasonably to the energies calculated in the modified tight-binding model of Ding et al.

Raman scattering study of C120, a C60 dimer

Abstract A modified preparation method and results of a Raman scattering study for C 120 , a dimer of C 60 , are reported. The Raman features of C 120 are compared with those of the dimer-like oxides C 120 O and C 120 O 2 , phototransformed C 60 and with calculations.

Lattice dynamics and electron-phonon coupling in transition-metal diborides

The phonon density of states of transition metal diborides

Phonon spectrum and soft-mode behavior ofMgCNi3

T{\mathrm{B}}_{2}

Electron-Phonon Coupling and Superconductivity in MgB2 and Related Diborides

with

High-resolution thermal expansion of MgB2

T=\mathrm{Ti},

Dimerization of C70 under high pressure: Thermal dissociation and photophysical properties of the dimer C140

V, Ta, Nb, and Y has been measured using the technique of inelastic neutron scattering. The experimental data are compared with ab initio density-functional calculations whereby an excellent agreement is registered. The calculations thus can be used to obtain electron-phonon spectral functions within the isotropic limit. A comparison with similar data for

Non-adiabatic effects in the phonon dispersion of Mg 1−x Al x B 2

{\mathrm{MgB}}_{2}

Hydrogen storage in carbon nanotubes: A neutron scattering investigation

and