Communications in Physics,
Journal Year:
2024,
Volume and Issue:
34(4), P. 413 - 413
Published: Dec. 19, 2024
A
facile
and
controllable
one-step
atmospheric
pressure
microplasma
method
was
employed
to
synthesize
nitrogen-doped
carbon
quantum
dots
(N-CQDs)
with
tunable
optical
properties.
The
N-CQDs
were
characterized
using
Fourier
transform
infrared
spectroscopy,
high-resolution
transmission
electron
microscopy,
UV‒Vis
absorption
photoluminescence
spectroscopy.
HRTEM
revealed
uniformly
distributed
spherical
nanoparticles
a
graphite-like
structure.
FTIR
confirmed
effective
nitrogen
doping,
enhancing
chemical
stability.
spectroscopy
redshifted
peaks,
indicating
improved
electronic
interactions
reduced
bandgap
(4.05
eV)
compared
those
of
undoped
CQDs
(4.18
eV).
PL
analysis
excitation-dependent
emission
significantly
higher
yield
(PLQY)
33.09%.
These
results
suggest
that
hold
promise
for
applications
in
optoelectronics
bioimaging,
providing
foundation
further
optimization
future
studies.
Analytical Methods,
Journal Year:
2024,
Volume and Issue:
16(15), P. 2267 - 2277
Published: Jan. 1, 2024
Construction
of
a
stable
fluorescent
sensor
based
on
CsPbBr
3
/CdS
core/shell
quantum
dots
for
selective
and
sensitive
detection
tetracycline
in
ethanol
via
mechanism
integrating
photoinduced
electron
transfer.
Advanced Optical Materials,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 31, 2024
Abstract
O
‐phenylenediamine
(OPD)
is
commonly
used
as
a
precursor
in
the
preparation
of
red
emissive
carbon
quantum
dots
(R‐CQDs)
due
to
sp
2
hybridized
structure.
However,
low
fluorescence
yield
(QY)
OPD‐based
R‐CQDs
limits
its
application.
Although
some
efforts
have
been
made,
improvement
QY
still
limited.
In
this
paper,
strategy
proposed
improve
by
introducing
ethylenediamine
(EDA),
which
plays
key
role
nitrogen
(N)
dopant
high
N
content.
The
molar
ratio
OPD
EDA
(M
/M
),
reaction
time
(t)
and
temperature
(T),
amount
concentrated
H
SO
4
(V
H2SO4
are
optimized.
with
32.65%
full
width
at
half
maximum
(FWHM)
emission
narrow
25
nm
obtained
via
hydrothermal
procedure
under
optimal
experimental
conditions
(i.e.,
M
=
1/3,
t
6
h,
T
180
°C
V
mL).
Such
higher
than
most
reported
R‐CQDs.
Besides,
it
found
that
acts
catalyst
addition
protonation.
enhancement
attributed
increase
aromatic
N‐containing
heterocyclic
structures
(C═N)
after
introduction
catalysis
.
Communications in Physics,
Journal Year:
2024,
Volume and Issue:
34(4), P. 413 - 413
Published: Dec. 19, 2024
A
facile
and
controllable
one-step
atmospheric
pressure
microplasma
method
was
employed
to
synthesize
nitrogen-doped
carbon
quantum
dots
(N-CQDs)
with
tunable
optical
properties.
The
N-CQDs
were
characterized
using
Fourier
transform
infrared
spectroscopy,
high-resolution
transmission
electron
microscopy,
UV‒Vis
absorption
photoluminescence
spectroscopy.
HRTEM
revealed
uniformly
distributed
spherical
nanoparticles
a
graphite-like
structure.
FTIR
confirmed
effective
nitrogen
doping,
enhancing
chemical
stability.
spectroscopy
redshifted
peaks,
indicating
improved
electronic
interactions
reduced
bandgap
(4.05
eV)
compared
those
of
undoped
CQDs
(4.18
eV).
PL
analysis
excitation-dependent
emission
significantly
higher
yield
(PLQY)
33.09%.
These
results
suggest
that
hold
promise
for
applications
in
optoelectronics
bioimaging,
providing
foundation
further
optimization
future
studies.
