Characterization of anisotropic conduction of horizontally aligned carbon nanotube thin films

In this paper, the anisotropic conductivities of Horizontally Aligned Carbon Nanotube (HACNT) thin film are characterized using Vector Network Analyzer (VNA) and four-probe technique. For microwave (X-band), the transmission experiments are performed in a waveguide setup and the conductivities of HACNT thin film are extracted using the uniform field approximation. For two CNTs orientation directions, the results are about 1000 S/m and 3000 S/m, respectively. The DC conductivities are measured using the four-probe method. The average conductivities are 1360 S/m and 1903 S/m, respectively. These results confirm the anisotropic conduction of HACNT thin film.