Thermoelectric Properties of Aerogels of PbS Nanoplatelets

Lars Klepzig^a, Jan Poppe^a, Eugen Klein^b, Christian Klinke^b^,^c, Armin Feldhoff^a, Nadja C. Bigall^a

^aInstitute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, DE, Callinstraße, 3A, Hannover, Germany

^bUniversity of Hamburg, Institute of Physical Chemistry, Hamburg, Germany

^cSwansea University, Department of Chemistry, Singleton Park, Swansea SA2 8PP, UK, Swansea, United Kingdom

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting 2018 (NFM18)

S6 Solution-based Two-dimensional Nanomaterials Sol2D

Torremolinos, Spain, 2018 October 22nd - 26th

Organizers: Christophe Delerue, Sandrine Ithurria and Christian Klinke

Oral, Lars Klepzig, presentation 340
DOI: https://doi.org/10.29363/nanoge.nfm.2018.340
Publication date: 6th July 2018

A solid-state assembly of nanoparticles for the use as a thermoelectric generator¹ is presented. The colloidal synthesis of the two-dimensional lead sulphide nanosheets was performed by oriented attachment of PbS nanoparticles². A self-supporting network of these anisotropic nanoplatelets was formed by slow destabilization of the colloidal solution by altering the pH value. Supercritical drying of such gel-type networks resulted in aerogels. These aerogel materials exhibit extremely low density, high surface to mass ratio and mesoporosity. The physical properties were characterized by transmission electron microscopy, scanning electron microscopy and N₂-physisorption measurements. The thermoelectric properties around room temperature were measured with a hot probe setup utilising multifunctional probes. Thus, the application of a temperature difference and the simultaneous measurement of the temperature difference and the induced thermovoltage was possible³. The material features the nanostructural benefits of aerogels while retaining the Seebeck coefficient of the bulk phase, enabling promising approaches for the use in thermoelectrical devices.

References:

[1] Feldhoff, A. Thermoelectric Material Tensor Derived from the Onsager-de Groot-Callen Model. Energy Harvest. Syst. 2015, 2, 5-13.

[2] Schliehe, C.; Juarez, B.; Pelletier, M.; Jander, S.; Greshnykh, D.; Nagel, M.; Meyer, A.; Foerster, S.; Kornowski, A.; Klinke, C.; Weller, H. Ultrathin PbS Sheets by Two-Dimensional Oriented Attachment. Science 2010, 329, 550-553

[3] García-Cañadas, J.; Min, G. Multifunctional probes for high.throughput measurement of Seebeck coefficient and electrical conductivity at room temperature. Rev. Sci. Instrum. 2014, 85, 043906

Acknowledgements:

The authors are grateful for financial support from the German Federal Ministry of Education and Research (BMBF) within the framework of the program NanoMatFutur, support code 03X5525, and the European Research Council (European Union’s Horizon 2020 research and innovation program, grant agreement 714429). Furthermore, the authors would like to acknowledge the Laboratory of Nano and Quantum Engineering (LNQE) at the Leibniz Universität Hannover for support.

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