Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The growth mechanism of CuO nanowires synthesized by the thermal
  oxidation method   Large-scale CuO nanowires are commonly synthesized by the thermal oxidation
method. However, the growth mechanism remains controversial between diffusion
growth mechanism and vapor-solid (VS) growth mechanism. In this study, we
investigated the morphology and atomic structure of the CuO nanowires by
electron microscopes to clarify the growth mechanism. We found that they were
grown with the annealing ambient during the cooling process and there were
screw dislocations in the nanowires. These features indicate that the VS growth
mechanism is applicable to explain the growth of the CuO nanowires. In
addition, the kinetic consideration also supports the VS growth mechanism.

2
The categories of this paper are: math
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con