Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Growth of New Extended Carbon Nanophases from Ferrocene Inside
  Single-Walled Carbon Nanotubes   The Raman response of new structures grown after filling SWCNTs with
ferrocene and transformation at moderate high temperatures is demonstrated to
be very strong, even stronger than the response from the tubes. Transmission
electron microscopy demonstrates that the new objects are flat and exhibit a
structure similar to short fragments of nanoribbons. The growth process is
controlled by two different activation energies for low and high transformation
temperatures, respectively. Immediately after filling Raman pattern from a
precursor molecule are detected. Two different types of nanoribbons were
identified by selecting special laser energies for the Raman excitation. These
ribbons have the signature of quaterrylene and terrylene, respectively.

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The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
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The categories of this paper are: atom-ph
2
The categories of this paper are: math
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The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: plasm-ph
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The categories of this paper are: patt-sol