Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Atomically Thin Boron Nitride as an Ideal Spacer for Metal-Enhanced
  Fluorescence   The metal-enhanced fluorescence (MEF) considerably enhances the luminescence
for various applications, but its performance largely depends on the dielectric
spacer between the fluorophore and plasmonic system. It is still challenging to
produce a defect-free spacer having an optimized thickness with a subnanometer
accuracy that enables reusability without affecting the enhancement. In this
study, we demonstrate the use of atomically thin hexagonal boron nitride (BN)
as an ideal MEF spacer owing to its multifold advantages over the traditional
dielectric thin films. With rhodamine 6G as a representative fluorophore, it
largely improves the enhancement factor (up to ~95+-5), sensitivity (10^-8 M),
reproducibility, and reusability (~90% of the plasmonic activity is retained
after 30 cycles of heating at 350 {\deg}C in air) of MEF. This can be
attributed to its two-dimensional structure, thickness control at the atomic
level, defect-free quality, high affinities to aromatic fluorophores, good
thermal stability, and excellent impermeability. The atomically thin BN spacers
could increase the use of MEF in different fields and industries.

30
The categories of this paper are: q-alg
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph