Crystallographic control at the nanoscale to enhance functionality: Polytypic Cu2GeSe3 nanoparticles as thermoelectric materials

M. Ibáñez, R. Zamani, W. Li, D. Cadavid, S. Gorse, N. Katchoi, A. Shavel, A. López, J. Morante, J. Arbiol, A. Cabot, Chemistry of Materials 24 (2012) 4615–4622.

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Journal Article | Published | English
Author
Ibanez Sabate, MariaIST Austria ; Zamani, Reza; Li, Wenhua; Cadavid, Doris; Gorse, Stéphane; Katchoi, Nebll; Shavel, Alexey; López, Antonioo; Morante, Joan; Arbiol, Jordi; Cabot, Andreu
Abstract
The potential to control the composition and crystal phase at the nanometer scale enable the production of nanocrystalline materials with enhanced functionalities and new applications. In the present work, we detail a novel colloidal synthesis route to prepare nanoparticles of the ternary semiconductor Cu2GeSe3 (CGSe) with nanometer-scale control over their crystal phases. We also demonstrate the structural effect on the thermoelectric properties of bottom-up-prepared CGSe nanomaterials. By careful adjustment of the nucleation and growth temperatures, pure orthorhombic CGSe nanoparticles with cationic order or polytypic CGSe nanoparticles with disordered cation positions can be produced. In this second type of nanoparticle, a high density of twins can be created to periodically change the atomic plane stacking, forming a hexagonal wurtzite CGSe phase. The high yield of the synthetic routes reported here allows the production of single-phase and multiphase CGSe nanoparticles in the gram scale, which permits characterization of the thermoelectric properties of these materials. Reduced thermal conductivities and a related 2.5-fold increase of the thermoelectric figure of merit for multiphase nanomaterials compared to pure-phase CGSe are systematically obtained. These results are discussed in terms of the density and efficiency of phonon scattering centers in both types of materials.
Publishing Year
Date Published
2012-11-14
Journal Title
Chemistry of Materials
Volume
24
Issue
23
Page
4615 - 4622
IST-REx-ID
377

Cite this

Ibáñez M, Zamani R, Li W, et al. Crystallographic control at the nanoscale to enhance functionality: Polytypic Cu2GeSe3 nanoparticles as thermoelectric materials. Chemistry of Materials. 2012;24(23):4615-4622. doi:10.1021/cm303252q
Ibáñez, M., Zamani, R., Li, W., Cadavid, D., Gorse, S., Katchoi, N., … Cabot, A. (2012). Crystallographic control at the nanoscale to enhance functionality: Polytypic Cu2GeSe3 nanoparticles as thermoelectric materials. Chemistry of Materials, 24(23), 4615–4622. https://doi.org/10.1021/cm303252q
Ibáñez, Maria, Reza Zamani, Wenhua Li, Doris Cadavid, Stéphane Gorse, Nebll Katchoi, Alexey Shavel, et al. “Crystallographic Control at the Nanoscale to Enhance Functionality: Polytypic Cu2GeSe3 Nanoparticles as Thermoelectric Materials.” Chemistry of Materials 24, no. 23 (2012): 4615–22. https://doi.org/10.1021/cm303252q.
M. Ibáñez et al., “Crystallographic control at the nanoscale to enhance functionality: Polytypic Cu2GeSe3 nanoparticles as thermoelectric materials,” Chemistry of Materials, vol. 24, no. 23, pp. 4615–4622, 2012.
Ibáñez M, Zamani R, Li W, Cadavid D, Gorse S, Katchoi N, Shavel A, López A, Morante J, Arbiol J, Cabot A. 2012. Crystallographic control at the nanoscale to enhance functionality: Polytypic Cu2GeSe3 nanoparticles as thermoelectric materials. Chemistry of Materials. 24(23), 4615–4622.
Ibáñez, Maria, et al. “Crystallographic Control at the Nanoscale to Enhance Functionality: Polytypic Cu2GeSe3 Nanoparticles as Thermoelectric Materials.” Chemistry of Materials, vol. 24, no. 23, American Chemical Society, 2012, pp. 4615–22, doi:10.1021/cm303252q.

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