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Screen-printed bismuth telluride nanostructured composites for flexible thermoelectric applications

Screen-printed bismuth telluride nanostructured composites for flexible thermoelectric applications
Screen-printed bismuth telluride nanostructured composites for flexible thermoelectric applications
We herein report the results of a facile two-step surfactant assisted reflux synthesis of bismuth telluride (Bi2Te3) nanowires (NWs). The as-synthesised NWs had diameters ranging from 70 to 110 nm with a length varying between 0.4 and 3 µm and a preferential lattice orientation of (0 1 5) as determined by grazing incidence x-ray diffraction. We demonstrate for the first time that a solvent/binder paste formulation of N-methyl-2-pyrrolidone/polyvinylidene fluoride (PVDF) is suitable for screen-printing the Bi2Te3 NWs with the potential for the fabrication of flexible thermoelectric (TE) materials. The wt% of PVDF in the composite films was varied from 10% to 20% to identify the optimal composition with a view to achieving maximum film flexibility whilst retaining the best TE performance. The films were screen-printed onto Kapton substrates and subjected to a post-printing annealing process to improve TE performance. The annealed and screen printed Bi2Te3/PVDF NW composites yielded a maximum Seebeck coefficient −192 µV K−1 with a power factor of 34 µW m−1K−2 at 225 K. The flexible screen printed composite films were flexible and found to be intact even after 2000 bending cycles.
bismuth telluride nanowires, screen-printing, thermoelectrics
2515-7655
Amin, Aran
0b64338d-d0e9-4373-ac36-60ae71b2665d
Huang, Ruomeng
c6187811-ef2f-4437-8333-595c0d6ac978
Newbrook, Daniel
8eb26553-e1e2-492d-ad78-ce51a487f31f
Sethi, Vikesh
e0c3adf8-b928-46c4-b59f-4428cafe7774
Yong, Sheng
688cbcf0-b32e-4b2b-9891-a0e0e1f59d71
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d
Nandhakumar, Iris S.
e9850fe5-1152-4df8-8a26-ed44b5564b04
Amin, Aran
0b64338d-d0e9-4373-ac36-60ae71b2665d
Huang, Ruomeng
c6187811-ef2f-4437-8333-595c0d6ac978
Newbrook, Daniel
8eb26553-e1e2-492d-ad78-ce51a487f31f
Sethi, Vikesh
e0c3adf8-b928-46c4-b59f-4428cafe7774
Yong, Sheng
688cbcf0-b32e-4b2b-9891-a0e0e1f59d71
Beeby, Stephen
ba565001-2812-4300-89f1-fe5a437ecb0d
Nandhakumar, Iris S.
e9850fe5-1152-4df8-8a26-ed44b5564b04

Amin, Aran, Huang, Ruomeng, Newbrook, Daniel, Sethi, Vikesh, Yong, Sheng, Beeby, Stephen and Nandhakumar, Iris S. (2022) Screen-printed bismuth telluride nanostructured composites for flexible thermoelectric applications. Journal of Physics: Energy, 4 (2), [024003]. (doi:10.1088/2515-7655/ac572e).

Record type: Article

Abstract

We herein report the results of a facile two-step surfactant assisted reflux synthesis of bismuth telluride (Bi2Te3) nanowires (NWs). The as-synthesised NWs had diameters ranging from 70 to 110 nm with a length varying between 0.4 and 3 µm and a preferential lattice orientation of (0 1 5) as determined by grazing incidence x-ray diffraction. We demonstrate for the first time that a solvent/binder paste formulation of N-methyl-2-pyrrolidone/polyvinylidene fluoride (PVDF) is suitable for screen-printing the Bi2Te3 NWs with the potential for the fabrication of flexible thermoelectric (TE) materials. The wt% of PVDF in the composite films was varied from 10% to 20% to identify the optimal composition with a view to achieving maximum film flexibility whilst retaining the best TE performance. The films were screen-printed onto Kapton substrates and subjected to a post-printing annealing process to improve TE performance. The annealed and screen printed Bi2Te3/PVDF NW composites yielded a maximum Seebeck coefficient −192 µV K−1 with a power factor of 34 µW m−1K−2 at 225 K. The flexible screen printed composite films were flexible and found to be intact even after 2000 bending cycles.

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Amin_2022_J._Phys._Energy_4_024003 - Version of Record
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Accepted/In Press date: 21 February 2022
e-pub ahead of print date: 30 March 2022
Keywords: bismuth telluride nanowires, screen-printing, thermoelectrics

Identifiers

Local EPrints ID: 456969
URI: http://eprints.soton.ac.uk/id/eprint/456969
ISSN: 2515-7655
PURE UUID: a0e6a3a3-f4c1-4f83-9c9b-0734daea9a3d
ORCID for Ruomeng Huang: ORCID iD orcid.org/0000-0003-1185-635X
ORCID for Sheng Yong: ORCID iD orcid.org/0000-0002-8588-5981
ORCID for Stephen Beeby: ORCID iD orcid.org/0000-0002-0800-1759
ORCID for Iris S. Nandhakumar: ORCID iD orcid.org/0000-0002-9668-9126

Catalogue record

Date deposited: 18 May 2022 17:03
Last modified: 19 May 2022 01:47

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Contributors

Author: Aran Amin
Author: Ruomeng Huang ORCID iD
Author: Daniel Newbrook
Author: Vikesh Sethi
Author: Sheng Yong ORCID iD
Author: Stephen Beeby ORCID iD

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