Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sensing electrochemical signals using a nitrogen-vacancy center in
  diamond   Chemical sensors with high sensitivity that can be used in extreme conditions
and can be miniaturized are of high interest in science and industry. The
Nitrogen-vacancy (NV) center in diamond is an ideal candidate as a nanosensor
due to the long coherence time of its electron spin and its optical
accessibility. In this theoretical work, we propose to use an NV center to
detect electrochemical signals emerging from an electrolyte solution, thus
obtaining a concentration sensor. For this purpose, we propose to use the
inhomogeneous dephasing rate of the electron spin of the NV center ($1/T^*_2$)
as a signal. We show that for a range of mean ionic concentrations in the bulk
of the electrolyte solution, the electric field fluctuations produced by the
diffusional fluctuations in the local concentration of ions, result in
dephasing rates which can be inferred from free induction decay measurements.
Moreover, we show that for a range of concentrations, the electric field
generated at the position of the NV center can also be used to estimate the
concentration of ions.

32
The categories of this paper are: atom-ph
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph