Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Green-Graphene protective overlayer on optical microfibers: pro-longs
  the device lifetime   Optical microfibers finds new applications in various fields of industry,
which in turn requires wear resistance, environmental friendliness and ease of
use. However, optical microfibers are fragile. Here we report a new method to
prolong the microfiber lifetime by modifying its surface with green-extracted
graphene overlayers. Graphene films were obtained by dispergation of shungite
mineral samples in an aqueous medium. For this, we tapered optical fibers and
sculptured them with graphene films mixed with gold nanoparticles. We observed
that due to the surface modification the lifetime and survivability of the
microfiber increased 5 times, as compared to the bare microfiber. The embedded
gold nanoparticles can also be utilized for enhanced sensitivity and other
applications.

2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an