Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory, preparation, properties and catalysis application in 2D
  Graphynes-Based Materials   Carbon has three hybridization forms of sp-, sp2- and sp3-, and the
combination of different forms can obtain different kinds of carbon allotropes,
such as diamond, carbon nanotubes, fullerene, graphynes (GYs) and graphdiyne
(GDY). Among them, the GDY molecule is a single-layer two-dimensional (2D)
planar structure material with highly -conjugation formed by sp- and sp2-
hybridization. GDY has a carbon atom ring composed of benzene ring and
acetylene, which makes GDY have a uniformly distributed pore structure. In
addition, GDY planar material have some slight wrinkles, which makes GDY have
better self-stability than other 2D planar materials. The excellent properties
of GDY make it attract the attention of researcher. Therefore, GDY is widely
used in chemical catalysis, electronics, communications, clean energy and
composite materials. This paper summarizes the recent progress of GDY research,
including structure, preparation, properties and application of GDY in the
field of catalysts.

3
The categories of this paper are: physics
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga