Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Growth of transparent Zn1-xSrxO films by facile wet chemical method:
  Effect of Sr doping on the structural, optical and sensing properties   Sr doped ZnO nanorods thin films are prepared using wet chemical technique on
transparent flexible substrate. Effect of Sr doping on structural and optical
properties of ZnO is systematically investigated. The sensing property of the
ZnO is enhanced by Sr doping and imitates as a promising material for future
toxic and flammable gas sensor applications as well as for optoelectronic
devices.

11
The categories of this paper are: hep-lat
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics