| 초록 |
Carbon nanotube (CNT) foams with various configurations of porous structures were fabricated using a simple vacuum-evaporation process for thermoelectric generators. The CNT foams exhibit quite low thermal conductivity of 0.17 W m-1 K-1, which value is 100 times lower than that of a non-porous CNT film. For thermoelectric applications, the CNT foams were doped with p- or n-molecular dopants to further improve the electrical conductivity and the Seebeck coefficient. Finally, a thermoelectric generator with a combination of series and parallel mixed circuit was fabricated using the p/n-doped CNT foams. The maximum power output and the output power per weight of thermoelectric generator reach to 1.01 μW and 15 μW g-1 at temperature difference of 16.2 °C, respectively. This work demonstrates that forming a highly porous CNT structure using a vacuum-evaporation method is a very effective strategy for the realization of free-shaped thermoelectric materials with low thermal conductivity. |
