Multi walled carbon nanotubes (MWCNTs) and carbonized resorcinol-formaldehyde (RF) resin were used to create a conducting aerogel with a high electrical conductivity and Seebeck coefficient but a low thermal conductivity. The addition of the MWCNTs caused the figure of merit (ZT) for the aerogel to increase by two orders of magnitude. The researchers determined that it was possibly to control the electrical conductivity, thermal conductivity, and Seebeck coefficient independently of ...
Author(s): Aiping Zhang, Jinghong Zhao, Jinrong Wu, Lijuan Zhao, Quan Li, Xijing Sun
This article studied the effect of the addition of TiO2 nanoinclusions on bulk Ba8Ga16Ge30clathrate. Both thermal conductivity and electrical resistivity were investigated. Results produced by the TPS system revealed that thermal conductivity decreased as the amount of nanoinclusions increased. The authors concluded that a shift in the peak value of the Seebeck coefficient had occurred. Electrical resistivity increased with the addition....
Author(s): A. E. C. Palmqvist, Daniel Cederkrantz, M. Nygren, R. Heijl
The authors present a method of producing Cu2CdSnSe4 quaternary nanocrystals using a colloidal synthesis route that could be used for future industrial synthesis. The nanocrystals prepared showed great potential for use as a thermoelectric material due to their high thermoelectric figure of merit (up to 0.71) resulting from a high electrical conductivity and low thermal conductivity. The authors believed that these properties could be further tuned in order to increase ...
Author(s): Alejandro PC)rez-RodrC-guez, Alejandro Perez-RodriB-guez, Alexey Shavel, Andreu Cabot, Andrew Fairbrother, Doris Cadavid, Joan Daniel Prades, Joan Ramon Morante, Jordi Arbiol, Maria Ibanez, Nuria GarcC-a-CastellC3, Nuria GarciB-a-Castello, Reza Zamani, Victor Izquierdo-Roca, Wenhua Li
The laser floating zone method was used to prepare Pb doped Bi2-xPbxBa2Co2Oy thermoelectric materials with x=0, 0.2, 0.4, and 0.6. The highest power factor reported was obtained at 650oC for the 0.2 Pb doped samples. This value was higher than that for pure laser grown Bi2Ba2Co2Oy materials. The thermal conductivity was decreased, as is desired in thermoelectric materials....
Author(s): A. Sotelo, F. M. Costa, J. C. Diez, J. S. Amaral, M. A. Madre, M. A. Torres, N. M. Ferreira, S. I. R. Costa, Sh. Rasekh, V. S. Amaral
This paper proposes conducting carbon aerogels, composed of graphene and multi-walled carbon nanotubes, as an option for a thermoelectric material. The researchers found that this combination of materials increased the electrical conductivity and the Seebeck coefficient due to bridging effects, and decreased the thermal conductivity through high porosity and a uniquely structured 3-D skeleton. Atomic force microscopy and X-ray diffraction were used to quantify the physical structure of the aerogels. ...
Author(s): Aiping Zhang, Jinghong Zhao, Jinrong Wu, Lijuan Zhao, Quan Li, Xijing Sun, Zhouyue Lei
