Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Moir\'e induced organization of size-selected Pt clusters soft landed on
  epitaxial graphene   Two-dimensional hexagonal arrays of Pt nanoparticles (1.45 nm diameter) have
been obtained by deposition of preformed and size selected Pt80 nanoparticles
on graphene. This original self-organization is induced, at room temperature,
by the 2D periodic undulation (the moir\'e pattern) of graphene epitaxially
grown on the Ir(111) surface. By means of complementary techniques (scanning
tunneling microscopy, grazing incidence X ray scattering), the Pt clusters
shapes and organization are characterized and the structural evolution during
annealing is investigated. The soft-landed clusters remain quasi-spherical and
a large proportion appears to be pinned on specific moir\'e sites. The
quantitative determination of the proportion of organized clusters reveals that
the obtained hexagonal array of the almost spherical nanoparticles is stable up
to 650 K, which is an indication of a strong cluster-surface interaction.

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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-th
3
The categories of this paper are: physics
7
The categories of this paper are: hep-th
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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
5
The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: plasm-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: bayes-an