Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solvent Exfoliation of Electronic-Grade, Two-Dimensional Black
  Phosphorus   Solution dispersions of two-dimensional (2D) black phosphorus (BP), often
referred to as phosphorene, are achieved by solvent exfoliation. These
pristine, electronic-grade BP dispersions are produced with anhydrous, organic
solvents in a sealed tip ultrasonication system, which circumvents BP
degradation that would otherwise occur via solvated oxygen or water. Among
conventional solvents, n-methyl-pyrrolidone (NMP) is found to provide stable,
highly concentrated (~0.4 mg/mL) BP dispersions. Atomic force microscopy,
scanning electron microscopy, transmission electron microscopy, Raman
spectroscopy, and X-ray photoelectron spectroscopy show that the structure and
chemistry of solvent-exfoliated BP nanosheets are comparable to mechanically
exfoliated BP flakes. Additionally, residual NMP from the liquid-phase
processing suppresses the rate of BP oxidation in ambient conditions.
Solvent-exfoliated BP nanosheet field-effect transistors (FETs) exhibit
ambipolar behavior with current on/off ratios and mobilities up to ~10000 and
~50 cm^2/(V*s), respectively. Overall, this study shows that stable, highly
concentrated, electronic-grade 2D BP dispersions can be realized by scalable
solvent exfoliation, thereby presenting opportunities for large-area,
high-performance BP device applications.

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The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg