Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The electronic properties of doped single walled carbon nanotubes and
  carbon nanotube sensors   We present ab initio calculations on the band structure and density of states
of single wall semiconducting carbon nanotubes with high degrees (up to 25%) of
B, Si and N substitution. The doping process consists of two phases: different
carbon nanotubes (CNTs) for a constant doping rate and different doping rates
for the zigzag (8, 0) carbon nanotube. We analyze the doping dependence of
nanotubes on the doping rate and the nanotube type. Using these results, we
select the zigzag (8, 0) carbon nanotube for toxic gas sensor calculation and
obtain the total and partial densities of states for CNT (8, 0). We have
demonstrated that the CNT (8, 0) can be used as toxic gas sensors for CO and NO
molecules, and it can partially detect Cl$_2$ toxic molecules but cannot detect
H$_2$S. To overcome these restrictions, we created the B and N doped CNT (8, 0)
and obtained the total and partial density of states for these structures. We
also showed that B and N doped CNT (8, 0) can be used as toxic gas sensors for
such molecules as CO, NO, Cl$_2$ and H$_2$S.

7
The categories of this paper are: hep-th
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin