Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the Electrical Properties of Overlapped Graphene Grain
  Boundaries by Raman spectroscopy   The effect of grain boundaries and wrinkles on the electrical properties of
polycrystalline graphene is pronounced. Here we investigate the stitching
between grains of polycrystalline graphene, specifically, overlapping of layers
at the boundaries, grown by chemical vapor deposition (CVD) and subsequently
doped by the oxidized Cu substrate. We analyze overlapped regions between 60
and 220 nm wide via Raman spectroscopy, and find that some of these overlapped
boundaries contain AB stacked bilayers. The Raman spectra from the overlapped
grain boundaries are distinctly different from bilayer graphene and exhibit
splitting of the G band peak. The degree of splitting, peak widths, as well as
peak intensities depend on the width of the overlap. We attribute these
features to inhomogeneous doping by charge carriers (holes) across the
overlapped regions via the oxidized Cu substrate. As a result, the Fermi level
at the overlapped grain boundaries lies between 0.3 and 0.4 eV below the charge
neutrality point. Our results suggest an enhancement of electrical conductivity
across overlapped grain boundaries, similar to previously observed
measurements(1). The dependence of charge distribution on the width of
overlapping of grain boundaries may have strong implications for the growth of
large-area graphene with enhanced conductivity.

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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org