Scalable Electrically Conductive Spray Coating Based on Block Copolymer Nanocomposites

Junpyo Kwon, Katherine Evans, Ma Le Ma, Daniel Arnold, M. Erden Yildizdag, Tarek Zohdi, Robert O. Ritchie, Ting Xu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Currently available conductive inks present a challenge to achieving electrical performance without compromising mechanical properties, scalability, and processability. Here, we have developed blends of carbon black and the commercially available triblock copolymer (BCP), poly(styrene-ethylene-butylene-styrene)-g-maleic anhydride (SEBS-g-MAH) (FG1924G, Kraton), that can be readily applied as a conductive coating via a spray-coating process, for a wide range of insulating materials (fabric, wood, glass, and plastic). Simple but effective mechanical and chemical modifications of the ingredients can increase the electrical conductivity (∼100 S/m) by an order of magnitude more than previously reported for carbon black composites; moreover, the coatings display excellent mechanical flexibility (tensile strain ϵ ∼5.00 mm/mm). To correlate electrical conductivity and nanoscale structural changes with mechanical deformation, small-angle X-ray scattering (SAXS) during in situ tensile testing was performed. We show that the nanocomposite can be produced using low-cost ingredients (∼$ 10/kg), ensuring scalability for fabrication of large-scale devices without specialized material synthesis. Equally important, the phase behavior of block copolymers can enable recovery from physical damage via thermal annealing, which is critical for product longevity.

Original languageEnglish
Pages (from-to)8687-8694
Number of pages8
JournalACS applied materials & interfaces
Volume12
Issue number7
DOIs
Publication statusPublished - 19 Feb 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
Copyright © 2020 American Chemical Society.

Funding

This work was funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract DE-AC02-05-CH11231 (Organic–Inorganic Nanocomposites KC3104). SAXS was performed at beamline 7.3.3 at the Advanced Light Source, which is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract no. DE-AC02-05-CH11231. J.K. was supported at UC Berkeley by a Jane Lewis Fellowship. This work was funded by the U.S. Department of Energy Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract DE-AC02-05-CH11231 (Organic?Inorganic Nanocomposites KC3104). SAXS was performed at beamline 7.3.3 at the Advanced Light Source, which is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under contract no. DE-AC02-05-CH11231. J.K. was supported at UC Berkeley by a Jane Lewis Fellowship.

FundersFunder number
Office of Basic Energy Sciences
U.S. Department of Energy Office of Science
U.S. Department of Energy
Office of Science
Division of Materials Sciences and EngineeringDE-AC02-05-CH11231, KC3104

    Keywords

    • block copolymers nanocomposites
    • conductive coatings
    • in situ small-angle X-ray scattering
    • scalability
    • spray coatings

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