Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One nanometer thin carbon nanosheets with tunable conductivity and
  stiffness   We present a new route for the fabrication of ultrathin (~1 nm) carbon films
and membranes, whose electrical behavior can be tuned from insulating to
conducting. Self-assembled monolayers of biphenyls are cross-linked by
electrons, detached from the surfaces and subsequently pyrolized. Above 1000K,
the cross-linked aromatic monolayer forms a mechanically stable graphitic
phase. The transition is accompanied by a drop of the sheet resistivity from
~10^8 to ~10^2 kOhm/sq and a mechanical stiffening of the nanomembranes from
~10 to ~50 GPa. The technical applicability of the nanosheets is demonstrated
by incorporating them into a microscopic pressure sensor

30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
3
The categories of this paper are: physics
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph