Thermoelectric and mechanical properties of multi-walled carbon nanotube doped Bi0.4Sb1.6Te3 thermoelectric material

Fei Ren; Hsin Wang; Paul A. Menchhofer; James O. Kiggans

doi:10.1063/1.4834700

Thermoelectric and mechanical properties of multi-walled carbon nanotube doped Bi_0.4Sb_1.6Te₃ thermoelectric material

Fei Ren, Hsin Wang, Paul A. Menchhofer, James O. Kiggans

Nuclear Energy Materials Microanalysis

Research output: Contribution to journal › Article › peer-review

73 Scopus citations

Abstract

Since many thermoelectrics are brittle in nature with low mechanical strength, improving their mechanical properties is important to fabricate devices such as thermoelectric power generators and coolers. In this work, multiwalled carbon nanotubes (CNTs) were incorporated into polycrystalline Bi_0.4Sb_1.6Te₃ through powder processing, which increased the flexural strength from 32 MPa to 90 MPa. Electrical and thermal conductivities were both reduced in the CNT containing materials, leading to unchanged figure of merit. Dynamic Young's and shear moduli of the composites were lower than the base material, while the Poisson's ratio was not affected by CNT doping.

Original language	English
Article number	221907
Journal	Applied Physics Letters
Volume	103
Issue number	22
DOIs	https://doi.org/10.1063/1.4834700
State	Published - Nov 25 2013

Funding

The research was sponsored by the ORNL Laboratory Directed Research and Development Seed Money Program, under DOE Contract No. DE-AC05-00OR22725 with UT-Battelle, LLC.

Funders	Funder number
U.S. Department of Energy
Laboratory Directed Research and Development

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AU - Kiggans, James O.

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AB - Since many thermoelectrics are brittle in nature with low mechanical strength, improving their mechanical properties is important to fabricate devices such as thermoelectric power generators and coolers. In this work, multiwalled carbon nanotubes (CNTs) were incorporated into polycrystalline Bi0.4Sb1.6Te3 through powder processing, which increased the flexural strength from 32 MPa to 90 MPa. Electrical and thermal conductivities were both reduced in the CNT containing materials, leading to unchanged figure of merit. Dynamic Young's and shear moduli of the composites were lower than the base material, while the Poisson's ratio was not affected by CNT doping.

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Thermoelectric and mechanical properties of multi-walled carbon nanotube doped Bi_0.4Sb_1.6Te₃ thermoelectric material

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