Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Graphene-Polyurethane Coatings for Deformable Conductors and
  Electromagnetic Interference Shielding   Electrically conductive, polymeric materials that maintain their conductivity
even when under significant mechanical deformation are needed for actuator
electrodes, conformable electromagnetic shielding, stretchable tactile sensors
and flexible energy storage. The challenge for these materials is that the
percolated, electrically conductive networks tend to separate even at low
strains, leading to significant piezoresistance. Herein, deformable conductors
were fabricated by spray-coating a nitrile substrate with a graphene-elastomer
solution. The coatings showed only slight increase in electrical resistance
after thousands of bending cycles and repeated folding-unfolding events. The
deformable conductors doubled their electrical resistance at 12% strain and
were washable without changing their electrical properties. The
conductivity-strain behaviour was modelled by considering the nanofiller
separation upon deformation. To boost the conductivity at higher strains, the
production process was adapted by stretching the nitrile substrate before
spraying, after which it was released. This adaption meant that the electrical
resistance doubled at 25 % strain. The electrical resistance was found
sufficiently low to give a 1.9 dB/{\mu}m shielding in the 8-12 GHz
electromagnetic band. The physical and electrical properties, including the EM
screening, of the flexible conductors, were found to deteriorate upon cycling
but could be recovered through reheating the coating.

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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
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The categories of this paper are: patt-sol