Zhenxia Wang

Chirality dependence of the thermal conductivity of carbon nanotubes

The thermal conductivities of three types of single-wall carbon nanotubes are studied using the homogeneous non-equilibrium Green–Kubo method based on the Brenner potential. The thermal conductivity of a carbon nanotube is found to have dependence on its chirality. The thermal conductivities of three types of nanotube seem to have similar temperature dependence. The thermal conductivity of the chiral nanotube is lower than that of the other two types of nanotube.

Thermal conductivity of functionalized single-wall carbon nanotubes

The thermal conductivity at 300 K of (10, 0) single-wall carbon nanotubes (SWNTs) that have been functionalized by chemical attachment of hydrogen atoms is studied by a nonequilibrium molecular dynamics (MD) method with Brenner II potential. The system exhibits a drop in thermal conductivity with functionalization. When 5% of nanotube carbon atoms are hydrogenated, the thermal conductivity is reduced by about a factor of 1.5. To clarify this effect the phonon spectra of the nanotubes are investigated.

The conductivity of single walled nanotube films in Terahertz region

The conductivity of single-walled nanotube films is investigated with a combination of Maxwell-Garnett (MG) and Drude-Lorentzian (DL) model in terahertz region. A theoretical investigation for the recent experiment is given and a decrease of the real conductivity with increasing frequency is predicted. Meanwhile, the real part of dielectric function of single-walled carbon nanotube films is displayed

One-dimensional carbon nanotube-FexCy nanocrystal composite

Ferromagnetic material–carbon nanotube composites are promising magnetic nanowires that have recently been prepared, with many possible applications. In this paper, using carbon nanotubes as a nucleate template, one-dimensional carbon nanotube–FexCy nanocrystal composites were successfully synthesized by the chemical combination of sputtered Fe atoms and carbon nanotubes at high temperature. The structural characterization, by scanning electron microscopy, x-ray diffraction and high-resolution transmission electron microscopy, reveals that FexCy nanocrystal particles (5–20 nm diameter) were uniformly embedded in the walls of the carbon nanotubes with a high density. In addition, the formation mechanism of the composite is discussed.

The magneto-optical Kerr effect of InSb in Terahertz region

A theoretical investigation for the magneto-optical Kerr effect of InSb in Terahertz region is carried out. The results show an enhancement of Kerr effect both at room temperature and a low temperature in Terahertz region. The enhancement of Kerr spectrum due to the plasma edge effect is put forward. Meanwhile, the magneto-optical Kerr effect spectrum of InSb in the different external magnetic fields are discussed. The peak shifts of the Kerr rotation under different external magnetic fields and temperatures are discussed.