Microchimica Acta,
Journal Year:
2025,
Volume and Issue:
192(2)
Published: Jan. 15, 2025
Abstract
The
hydrothermal
synthesis
is
presented
of
copper-doped
carbon
dots
(Cu-CDs)
from
citric
acid,
urea,
and
copper
chloride,
resulting
in
blue-fluorescent
particles
with
stable
emission
at
438
nm
when
excited
340
nm.
Through
comprehensive
spectroscopic
microscopic
characterization
(FTIR,
XPS,
UV,
HRTEM),
the
Cu-CDs
demonstrated
remarkable
stability
across
varying
pH
levels,
ionic
strengths,
temperatures,
UV
exposure.
Notably,
exhibit
ultra-sensitive
selective
detection
hexavalent
chromium
[Cr(VI)]
ions
aqueous
environments
driven
by
fluorescence
quenching.
system
showed
a
robust
linear
response
to
Cr(VI)
0–80
µM
range,
an
impressive
limit
(LOD)
0.186
µM,
significantly
lower
than
WHO’s
permissible
0.96
µM.
These
findings
position
as
effective
tool
for
environmental
monitoring
water
safety
applications.
Graphical
Nanomaterials,
Journal Year:
2025,
Volume and Issue:
15(6), P. 436 - 436
Published: March 12, 2025
It
is
of
great
significance
to
develop
carbon
quantum
dots
(CQDs)
using
green
sources,
which
are
cheap,
non-toxic
and
harmless,
further
expand
their
application
scopes,
e.g.,
fluorescence
sensors,
blue
light
screening.
In
this
study,
we
have
prepared
Peperomia
tetraphylla-based
(PT-CQDs)
with
strong
water
solubility,
good
salt
resistance,
specific
quenching
reactions
excellent
optical
properties
via
a
simple
one-step
hydrothermal
method.
one
application,
PT-CQDs
utilized
as
sensor
due
high
selectivity
sensitivity
ferric
ions
(Fe3+).
The
limit
detection
(LOD)
was
2.7
μmol·L−1.
On
the
other
hand,
PT-CQDs/polyvinyl
alcohol
(PVA)
films
ultraviolet-
(UV)
high-energy
(HEBL)-blocking
were
obtained.
obtained
exhibited
weight
blocking
rate
100%
in
UV
80%
HEBL.
concentrations
composites
could
also
be
controlled
achieve
desired
light-blocking
rate.
addition,
able
absorb
convert
it
forms
light.
These
suggest
potential
applications
development
advanced
screening
sensors.
Scientific Reports,
Journal Year:
2025,
Volume and Issue:
15(1)
Published: March 25, 2025
Abstract
This
study
investigates
the
preparation
and
characterization
of
a
novel
HPMC-MCDs
(Hydroxypropyl
methylcellulose-magnetite
carbon
dots)
composite
film
for
potential
applications
in
food
safety
monitoring.
While
dots
(CDs)
offer
promising
sensing
capabilities,
their
inherent
lack
color
limits
direct
visual
detection,
limitation
addressed
this
work
by
incorporating
magnetite
(Fe
3
O
4
)
to
create
visually
discernible
sensor.
Characterization
techniques,
including
XRD,
FTIR,
SEM,
confirmed
successful
integration
MCDs
within
HPMC
matrix.
The
incorporation
significantly
reduced
film’s
surface
roughness.
exhibited
remarkably
smooth
surface.
DFT
calculations
revealed
enhanced
stability
composite.
Fluorescence
studies
demonstrated
change
upon
interaction
with
Salmonella
enterica
B.
cereus
,
suggesting
bacterial
detection.
Furthermore,
pH-sensitive
behavior,
changing
response
pH
variations,
making
it
candidate
monitoring
beef
meat
spoilage.
These
findings
suggest
that
have
serve
as
multifunctional
platform
applications.
