Pharmaceutics,
Journal Year:
2023,
Volume and Issue:
15(3), P. 1019 - 1019
Published: March 22, 2023
Recently,
carbon
dots
(CDs)
have
been
actively
studied
and
reported
for
their
various
properties.
In
particular,
the
specific
characteristics
of
considered
as
a
possible
technique
cancer
diagnosis
therapy.
This
is
also
cutting-edge
technology
that
offers
fresh
ideas
treating
disorders.
Though
are
still
in
infancy
not
yet
shown
value
to
society,
discovery
has
already
resulted
some
noteworthy
advancements.
The
application
CDs
indicates
conversion
natural
imaging.
Photography
using
demonstrated
extraordinary
appropriateness
bio-imaging,
novel
drugs,
delivery
targeted
genes,
bio-sensing,
photodynamic
therapy,
diagnosis.
review
seeks
provide
comprehensive
understanding
CDs,
including
benefits,
characteristics,
applications,
mode
action.
this
overview,
many
CD
design
strategies
will
be
highlighted.
addition,
we
discuss
numerous
studies
on
cytotoxic
testing
demonstrate
safety
CDs.
current
study
address
production
method,
mechanism,
ongoing
research,
ACS Nano,
Journal Year:
2024,
Volume and Issue:
18(3), P. 2421 - 2433
Published: Jan. 8, 2024
Carbon
quantum
dots
(CQDs)
are
one
of
the
most
promising
types
fluorescent
nanomaterials
due
to
their
exceptional
water
solubility,
excellent
optical
properties,
biocompatibility,
chemical
inertness,
refractive
index,
and
photostability.
Nitrogen-containing
CQDs,
which
include
amino
acid
based
especially
attractive
high
yield,
thermal
stability,
potential
biomedical
applications.
Recent
studies
have
attempted
improve
preparation
CQDs.
However,
highest
yield
obtained
for
these
was
only
44%.
Furthermore,
indices
derived
CQDs
were
not
determined.
Here,
we
systematically
explored
performance
prepared
from
all
20
coded
acids
using
modified
hydrothermal
techniques
allowing
more
passivation
layers
on
surface
optimize
performance.
Intriguingly,
ever
reported
any
The
values
differed
among
acids,
with
found
positively
charged
including
arginine-CQDs
(∼2.1),
histidine-CQDs
(∼2.0),
lysine-CQDs
(∼1.8).
here
showed
a
nearly
2-fold
increase
in
(∼86%)
longer
decay
time
(∼8.0
ns)
compared
previous
reports.
In
addition,
also
demonstrated
that
CQD
materials
displayed
excitation-dependent
emission
profiles
(from
UV
visible)
photostable,
water-soluble,
noncytotoxic,
contrast
live
cell
imaging
or
bioimaging.
These
results
indicate
high-refractive-index
applicable
optoelectronic
devices,
bioimaging,
biosensing,
studying
cellular
organelles
vivo.
This
extraordinary
RI
may
be
highly
useful
exploring
elements
different
densities.
Carbon Neutralization,
Journal Year:
2024,
Volume and Issue:
3(2), P. 245 - 284
Published: March 1, 2024
Abstract
Carbon
quantum
dots
(CQDs)
have
emerged
as
prominent
contenders
in
the
realm
of
luminescent
nanomaterials
over
past
decade
owing
to
their
tunable
optical
properties,
robust
photostability,
versatile
surface
functionalization
and
doping
potential,
low
toxicity,
straightforward
synthesis
utilizing
environmentally
friendly
precursors.
In
this
review,
we
commence
with
a
concise
introduction,
presenting
both
top‐down
bottom‐up
strategies
for
eco‐friendly
CQDs.
Subsequently,
delve
into
comprehensive
examination
CQDs'
structure
characteristics,
encompassing
ultraviolet–visible
absorption
confinement
effects,
state
emissions
contributing
room‐temperature
photoluminescence
(PL).
This
review
proceeds
elucidate
recent
advancements
modification
CQDs,
specifically
focusing
on
oxidation,
passivation,
incorporation
heteroatoms.
These
serve
afford
control
physicochemical
facilitating
enhancement
PL
through
decoration
highly
visible‐responsive
is
achieved
by
suppressing
nonradiative
recombination
electron‐hole
pairs,
enabling
red/blue
shifts
CQDs
generation
full‐color
emission
spectrum,
regulating
band‐gap
states
broaden
photoabsorption
range.
Finally,
offer
an
overview
most
developments
applications
fluorescent
emphasizing
utility
biomedicine,
sensors,
lighting,
displays,
well
photocatalysis.
Scientific Reports,
Journal Year:
2024,
Volume and Issue:
14(1)
Published: Jan. 4, 2024
Over
the
past
decade,
CdS
QDs
have
become
versatile
semiconductors.
Surface
modification
of
has
an
interesting
case
study,
as
it
can
eliminate
surface
defects
and
improve
their
photochemical
properties.
In
this
we
report
a
new
strategy
using
carbon
quantum
dots
containing
large
number
thiol
groups
(CQDs-SH)
passivating
agent
for
stabilization
(QDs).
Various
characterization
techniques
clearly
revealed
that
been
successfully
passivated
by
CQDs-SH.
The
photocatalytic
performance
CQDs-SH/CdS
was
investigated
degradation
insecticide
imidacloprid
from
aqueous
solution.
Parameters
affecting
photodegradation
process,
including
light
source,
photocatalyst
amount,
initial
concentration
pollutant,
radiation
time,
pH,
oxidizing
agent,
temperature,
were
investigated.
Furthermore,
HPLC
technique
applied
to
quantitatively
analyze
its
products.
results
analysis
under
simulated
visible
at
pH
9,
scarcely
existed
after
90
min
irradiation
(90.13%
degradation).
LC-MS
method
also
used
detect
products
investigate
mechanism
pesticide.
showed
composite
promising
in
wastewater.
Gels,
Journal Year:
2024,
Volume and Issue:
10(5), P. 296 - 296
Published: April 25, 2024
This
paper
proposes
a
new,
highly
effective
fluorescence
test
for
Cr(VI)
detection.
method
utilizes
hydrogel
composed
of
hydroxyethyl
cellulose
(HEC),
nitrogen-doped
carbon
quantum
dots
(N–CQDs),
and
poly(co-acrylamido-2-methyl-1-propane
sulfonic
acid)
(AMPS).
The
N–CQDs
were
successfully
synthesized
using
simple
microwave
method,
then
conjugated
with
HEC
AMPS.
higher
adsorption
(99.41%)
reduction
rate
in
H1
likely
stems
from
both
the
presence
(absent
HB)
their
increased
free
functional
groups
(compared
to
H2/H3,
where
block
them).
facilitates
release
(desorption)
hydrogels,
making
it
more
available
less
toxic
Cr(III).
fluorescent
brightness
HEC-N–CQDs-g-poly(AMPS)
increases
gradually
when
is
added
amounts
ranging
15
120
mg/L.
enhancement
appeared
exhibit
good
linear
relationship
15–120
mg
concentration,
detection
limit
0.0053
mg/L,
which
lower
than
standard
value
published
by
WHO.
Our
study
found
that
served
effectively
as
probe
aqueous
solutions,
demonstrating
high
sensitivity.
Small,
Journal Year:
2024,
Volume and Issue:
20(24)
Published: March 28, 2024
Abstract
The
process
of
N‐doping
is
frequently
employed
to
enhance
the
properties
carbon
quantum
dots.
However,
precise
requirements
for
nitrogen
precursors
in
producing
high‐quality
N‐doped
dots
(NCQDs)
remain
undefined.
This
research
systematically
examines
influence
various
dopants
on
morphology,
optical
features,
and
band
structure
NCQDs.
are
synthesized
using
an
efficient,
eco‐
friendly,
rapid
continuous
hydrothermal
flow
technique.
method
offers
unparalleled
control
over
synthesis
doping,
while
also
eliminating
convention‐related
issues.
Citric
acid
used
as
source,
urea,
trizma
base,
beta‐alanine,
L‐arginine,
EDTA
sources.
Notably,
urea
produced
NCQDs
with
excitation‐independent
fluorescence,
high
yields
(up
40%),
uniform
narrow
particle
size
distributions.
Density
functional
theory
(DFT)
time‐dependent
DFT
modelling
established
that
defects
substituents
within
graphitic
have
a
more
significant
impact
NCQDs’
electronic
than
nitrogen‐containing
groups.
Importantly,
first
time,
this
work
demonstrates
conventional
approach
single‐layer
structures
insufficient,
but
two
layers
suffice
replicating
experimental
data.
study,
therefore,
provides
essential
guidance
selection
NCQD
customization
diverse
applications.
