Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single step synthesis of size-controlled carbon quantum dots using
  electrochemical etching of graphite   Carbon Quantum dots (CQD's) are nanoscale sp2 hybridized carbon particles. In
this work, we present a simple one-step synthesis of CQDs from the
electrochemical shredding method and technique to control its size during its
growth process. A graphite rod extracted from commercially available pencil
batteries was used as electrode: source of carbon. CQDs of varying sizes were
synthesized through controlled current to the solution for etching and Sodium
dodecyl sulfate (SDS) as capping agent during growth. CQD's of controlled sizes
as formed can be used as fluorescent marker for bio-imaging and sensing
platform for wide range of applications.

12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc