Thermoelectric Transport Properties of Interface-Controlled p-type Bismuth Antimony Telluride Composites by Reduced Graphene Oxide
- 50 Downloads
We report the thermoelectric transport properties of interface-controlled p-type bismuth antimony telluride (BST) composites using reduced graphene oxide (rGO). The composites were prepared by the spark plasma sintering (SPS) of BST–graphene oxide (GO) hybrid powder, which could induce the in situ reduction of GO into rGO. Compared to the pristine BST, the interface-controlled BST composites exhibited degraded electrical conductivities with similar Seebeck coefficients, consequently resulting in decreased power factors. However, thanks to the suppressed lattice thermal conductivity by the rGO network at the grain boundaries, this disadvantage could be compensated in terms of ZT. Our results will be helpful for understanding thermoelectric transport properties of various graphene-hybrid thermoelectric materials.
KeywordsThermoelectric Bi2Te3 Interface control Reduced graphene oxide
This work was supported by the Midcareer Researcher Program (2018R1A2A2A05020902) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, Republic of Korea.
- 5.Scherrer, H., Scherrer, S.: Thermoelectric properties of bismuth antimony telluride solid solutions. In: Rowe, D.M. (ed.) Thermoelectrics Handbook: Macto to Nano, vol. 27. CRC Press, Boca Raton (2006)Google Scholar
- 18.Nam, W.H., Lim, Y.S., Kim, W., Seo, H.K., Dae, K.S., Lee, S., Seo, W.-S., Lee, J.Y.: A gigantically increased ratio of electrical to thermal conductivity and synergistically enhanced thermoelectric properties in interface-controlled TiO2–RGO nanocomposites. Nanoscale 9, 7830 (2017)CrossRefGoogle Scholar
- 20.Lee, S.T., Lim, Y.S.: Effects of interface control using reduced graphene oxide (RGO) on the thermoelectric transport properties of polycrystalline SnSe compounds. Korean J. Met. Mater. 56, 163 (2018)Google Scholar
- 26.Fan, Y., Jiang, W., Kawasaki, A.: Highly conductive few-layer graphene/Al2O3 nanocomposites with tunable charge carrier type. Nano Lett. 22, 3882 (2012)Google Scholar
- 34.An, T.-H., Lim, Y.S., Park, M.J., Tak, J.-Y., Lee, S., Cho, H.K., Cho, J.-Y., Park, C., Seo, W.-S.: Composition-dependent charge transport and temperature-dependent density of state effective mass interpreted by temperature-normalized Pisarenko plot in Bi2−xSbxTe3 compounds. APL Mater. 4, 104812 (2016)CrossRefGoogle Scholar