Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low entropy in graphene through the Co-C system   Uniform, mostly single-layer graphene with enhanced stability is demonstrated
over Co film. The polycrystalline Co film deposited on a SiO2/Si substrate
gives a continuous graphene layer that is easily transferred without the aid of
any polymeric support, but preserving the material quality, as evidenced by
Raman analysis. Great stability to the damaging action of the laser beam, as
compared to the Cu-grown material is also observed. The better structural and
electrical properties of the material are interpreted in terms of
thermodynamics of the cooling-down process. It is suggested that the reduction
in entropy, due annihilation of vacancies caused by C atoms precipitating
during cooling, directly depends on the activation energy of C solubility into
Co, which is considerably high, due to Co magnetic ordering at the process
temperature. Our work expands the possibility of synthesizing single-layer
graphene keeping into account the thermodynamics of various C-metal systems.

26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph