article published yes Yu Zhang author Yu Liu author 2A70014E-F248-11E8-B48F-1D18A9856A870000-0001-7313-6740 Mariano Calcabrini author Congcong Xing author Xu Han author Jordi Arbiol author Doris Cadavid author Maria Ibáñez author 43C61214-F248-11E8-B48F-1D18A9856A870000-0001-5013-2843 Andreu Cabot author MaIb department ISTplus - Postdoctoral Fellowships project Appropriately designed nanocomposites allow improving the thermoelectric performance by several mechanisms, including phonon scattering, modulation doping and energy filtering, while additionally promoting better mechanical properties than those of crystalline materials. Here, a strategy for producing Bi2Te3–Cu2xTe nanocomposites based on the consolidation of heterostructured nanoparticles is described and the thermoelectric properties of the obtained materials are investigated. We first detail a two-step solution-based process to produce Bi2Te3–Cu2xTe heteronanostructures, based on the growth of Cu2xTe nanocrystals on the surface of Bi2Te3 nanowires. We characterize the structural and chemical properties of the synthesized nanostructures and of the nanocomposites produced by hot-pressing the particles at moderate temperatures. Besides, the transport properties of the nanocomposites are investigated as a function of the amount of Cu introduced. Overall, the presence of Cu decreases the material thermal conductivity through promotion of phonon scattering, modulates the charge carrier concentration through electron spillover, and increases the Seebeck coefficient through filtering of charge carriers at energy barriers. These effects result in an improvement of over 50% of the thermoelectric figure of merit of Bi2Te3. Royal Society of Chemistry2020 eng 00058155910001510.1039/D0TC02182B 84014092-14099 Zhang, Yu, et al. “Bismuth Telluride-Copper Telluride Nanocomposites from Heterostructured Building Blocks.” <i>Journal of Materials Chemistry C</i>, vol. 8, no. 40, Royal Society of Chemistry, 2020, pp. 14092–99, doi:<a href="https://doi.org/10.1039/D0TC02182B">10.1039/D0TC02182B</a>. Zhang, Y., Liu, Y., Calcabrini, M., Xing, C., Han, X., Arbiol, J., … Cabot, A. (2020). Bismuth telluride-copper telluride nanocomposites from heterostructured building blocks. <i>Journal of Materials Chemistry C</i>. Royal Society of Chemistry. <a href="https://doi.org/10.1039/D0TC02182B">https://doi.org/10.1039/D0TC02182B</a> Y. Zhang, Y. Liu, M. Calcabrini, C. Xing, X. Han, J. Arbiol, D. Cadavid, M. Ibáñez, A. Cabot, Journal of Materials Chemistry C 8 (2020) 14092–14099. Zhang Y, Liu Y, Calcabrini M, et al. Bismuth telluride-copper telluride nanocomposites from heterostructured building blocks. <i>Journal of Materials Chemistry C</i>. 2020;8(40):14092-14099. doi:<a href="https://doi.org/10.1039/D0TC02182B">10.1039/D0TC02182B</a> Zhang, Yu, Yu Liu, Mariano Calcabrini, Congcong Xing, Xu Han, Jordi Arbiol, Doris Cadavid, Maria Ibáñez, and Andreu Cabot. “Bismuth Telluride-Copper Telluride Nanocomposites from Heterostructured Building Blocks.” <i>Journal of Materials Chemistry C</i>. Royal Society of Chemistry, 2020. <a href="https://doi.org/10.1039/D0TC02182B">https://doi.org/10.1039/D0TC02182B</a>. Y. Zhang <i>et al.</i>, “Bismuth telluride-copper telluride nanocomposites from heterostructured building blocks,” <i>Journal of Materials Chemistry C</i>, vol. 8, no. 40. Royal Society of Chemistry, pp. 14092–14099, 2020. Zhang Y, Liu Y, Calcabrini M, Xing C, Han X, Arbiol J, Cadavid D, Ibáñez M, Cabot A. 2020. Bismuth telluride-copper telluride nanocomposites from heterostructured building blocks. Journal of Materials Chemistry C. 8(40), 14092–14099. 87472020-11-09T08:37:51Z2025-04-14T07:43:50Z