Improved Anisotropic Thermoelectric Behavior of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) via Magnetophoresis

Zarubin, Vera A.; Li, Tai-De; Humagain, Sunita; Ji, Haojie; Yager, Kevin G.; Greenbaum, Steven G.; Vuong, Luat T.

doi:10.1021/acsomega.8b00999

Title: Improved Anisotropic Thermoelectric Behavior of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) via Magnetophoresis

Journal Article · 02 October 2018 · ACS Omega

DOI: https://doi.org/10.1021/acsomega.8b00999 · OSTI ID:1483563

^[1]; Li, Tai-De ^[2]; Humagain, Sunita ^[2]; Ji, Haojie ^[2];

^[3]; Greenbaum, Steven G. ^[2];

^[4]

Bronx High School of Science, Bronx, NY(United States)
City Univ. (CUNY), NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States)
City Univ. (CUNY), NY (United States); Univ. of California, Riverside, CA (United States)

There is strong demand for achieving morphological control of conducting polymers in its many potential applications, from energy harvesting to spintronics. Here, the static magnetic-field-induced alignment of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) particles is demonstrated. PEDOT:PSS thin films cast under modest mT-level magnetic fields exhibit a fourfold increase in the Seebeck coefficient and doubled electrical conductivity. Atomic force microscopy measurements confirm the presence of conducting islands that exhibit a 10-fold increase in the local charge carrier mobility and threshold behavior that is associated with phase separation. High-resolution scanning electron microscopy identifies a consistent structural coil-to-rod transition, and three-dimensional time-of-flight secondary-ion mass spectrometry imaging shows that the rodlike structures coincide with PEDOT domains that generally align with the magnetic field and cluster on the outer surface. Grazing-incidence small-angle X-ray scattering, Raman spectra, electron paramagnetic resonance, and circular dichroism spectroscopy point to the physical nature of the magnetophoretic alignment, which is expected to occur via magnetic coupling of PEDOT domains with polaron modes. Because casting under mT-level magnetic fields increases the electrical conductivity and Seebeck coefficient of PEDOT:PSS thin films without additional dopants that commonly limit the thermoelectric performance, our research reveals that low-field magnetophoresis significantly influences the structure and corresponding physical properties of PEDOT:PSS. Our results also point to concerns that the presence of small external magnetic fields in laboratory settings may appreciably and inadvertently influence the PEDOT:PSS morphology during settling, drying, or annealing processes.

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Research Organization:: Brookhaven National Lab. (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: SC0012704

OSTI ID:: 1483563

Report Number(s):: BNL--209503-2018-JAAM

Journal Information:: ACS Omega, Journal Name: ACS Omega Journal Issue: 10 Vol. 3; ISSN 2470-1343

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Solution aging and degradation of a transparent conducting polymer dispersion Li, Jun; Jacobs, Ian E.; Friedrich, Stephan Organic Electronics, Vol. 34 https://doi.org/10.1016/j.orgel.2016.04.019	journal	July 2016
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Coil-to-Rod Transition of Conjugated Polymers Prepared by Cyclopolymerization of 1,6-Heptadiynes Kang, Eun-Hye; Choi, Tae-Lim ACS Macro Letters, Vol. 2, Issue 9 https://doi.org/10.1021/mz400338p	journal	August 2013
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Substantial local variation of the Seebeck coefficient in gold nanowires Zolotavin, Pavlo; Evans, Charlotte I.; Natelson, Douglas Nanoscale, Vol. 9, Issue 26 https://doi.org/10.1039/c7nr02678a	journal	January 2017
Grain boundary scattering effects on mobilities in p-type polycrystalline SnSe Wang, Si; Hui, Si; Peng, Kunling J. Mater. Chem. C, Vol. 5, Issue 39 https://doi.org/10.1039/c7tc03022c	journal	January 2017
The texture related anisotropy of thermoelectric properties in bismuth telluride based polycrystalline alloys Shen, J. J.; Hu, L. P.; Zhu, T. J. Applied Physics Letters, Vol. 99, Issue 12 https://doi.org/10.1063/1.3643051	journal	September 2011
Electron spin resonance and electrical transport in films of poly (3,4-ethylenedioxythiophene) doped with poly(styrenesulphonate) Lee, Jung-Keun; You, Seunghun; Jeon, Sunam Journal of Applied Physics, Vol. 118, Issue 1 https://doi.org/10.1063/1.4923416	journal	July 2015
Thermoelectric Performance of Poly(3,4-ethylenedioxythiophene): Poly(styrenesulfonate) Feng-Xing, Jiang; Jing-Kun, Xu; Bao-Yang, Lu Chinese Physics Letters, Vol. 25, Issue 6 https://doi.org/10.1088/0256-307x/25/6/076	journal	May 2008
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Synthesis of a Terpene-Based New Chiral Inducer and Preparation of an Asymmetric Polymer Matsumura, Atsushi; Yang, Fan; Goto, Hiromasa Polymers, Vol. 7, Issue 1 https://doi.org/10.3390/polym7010147	journal	January 2015
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Title: Improved Anisotropic Thermoelectric Behavior of Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate) via Magnetophoresis

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