Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Properties of pulsed-laser deposited nanocomposite NiO:Au thin films for
  gas sensing applications   Nanocomposite thin films formed by gold nanoparticles embedded in a nickel
oxide matrix have been synthesized by a new variation of the pulsed laser
deposition technique. Two actively synchronized laser sources, a KrF excimer
laser at 248 nm and an Nd:YAG laser at 355 nm, were used for the simultaneous
ablation of nickel and gold targets in oxygen ambient. The structural,
morphological, and electrical properties of the obtained nanocomposite films
were investigated in relation to the fluence of the laser irradiating the gold
target. The nanocomposite thin films were tested as electrochemical hydrogen
sensors. It was found that the addition of the gold nanoparticles increased the
sensor sensitivity significantly.

36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con