SKM 2021 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 24: Poster Session: Transport

TT 24.5: Poster

Donnerstag, 30. September 2021, 13:30–16:00, P

An Atomistic Study of the Thermoelectric Signatures of CNT Peapods — •Alvaro Gaspar Rodriguez Mendez^1,2, Leonardo Medrano Sandonas³, Arezoo Dianat¹, Rafael Gutierrez¹, and Gianaurelio Cuniberti¹ — ¹Institute for Materials Science and Max Bergmann Center of Biomaterials, Tu Dresden, 01062 Dresden, Germany. — ²Max Planck Institute for Complex Systems, 01187 Dresden, Germany. — ³Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg.

Carbon-based nanomaterials have a great potential for the development of high performance thermoelectric (TE) materials because of their low-cost and for being environmentally friendly. Carbon nanotubes have, however, high electrical and thermal conductivities so that further nanoscale engineering is required to exploit them as TE materials. We investigate electron and phonon transport in CNT peapods to elucidate their potential advantage over pristine CNTs. We show their transport properties are sensitively modified by C60 encapsulation, when the CNT-C60 intermolecular interaction is strong enough to produce a periodic buckling of the CNT walls. Moreover, the phonon transmission is strongly suppressed at low and high frequencies, leading to a reduction of the phonon contribution to the overall thermal conductance, similar effect observed in recently proposed phononic metamaterials. We obtain in general a larger TE figure of merit over a broad temperature range for the CNT peapod when compared with the pristine CNT. Our findings show an alternative route for the enhancement of the TE performance of CNT-based devices.