Dongmok Lee

Enhanced thermoelectric properties of tungsten disulfide-multiwalled carbon nanotube composites

We investigated WS2–multiwalled carbon nanotube composites prepared by powder metallurgy. The inclusion of a small amount of nanotubes (0.75 wt%) dramatically increased electrical conductivity (by 12 300%) with a moderate decrease in the Seebeck coefficient (by 22%) and thermal conductivity (by 43%) enhancing both power factor and thermoelectric figure of merit at 300 K.

Electrical characterization of silver nanowire-graphene hybrid films from terahertz transmission and reflection measurements

We determined the electrical sheet conductivity of silver nanowire-graphene hybrid films from transmission and reflection terahertz time-domain spectroscopy measurements. The sheet resistance extracted from noncontact terahertz measurement is in good agreement with one measured with a classical 4-point-probe technique. The conductivity is well described by a Drude-Smith model and is calculated to peak around 10 THz.

Terahertz conductivity studies in carbon nanotube networks prepared by the vacuum filtration method

The electrical properties of carbon nanostructures have been greatly stimulating to use in the nanotechnology for electronic components. In this paper, we study the AC and DC electrical conductivity responses of multi-walled carbon nanotube films, prepared by the vacuum filtration methods, with noncontact terahertz time-domain spectroscopy (THz- TDS) approach utilizing the extrapolation analysis as well as probe-in line technique.