ACS Applied Nano Materials,
Год журнала:
2023,
Номер
6(9), С. 8046 - 8058
Опубликована: Апрель 27, 2023
Multicolor
emissive
nitrogen-doped
carbon
quantum
dots
(CQDs)
were
synthesized
by
the
hydrothermal
method
and
characterized
using
spectroscopic
electron
microscopic
techniques.
Förster
resonance
energy
transfer
(FRET)
between
CQDs
gold
nanorods
(AuNRs)
has
been
investigated
that
occurs
due
to
distinctive
overlap
of
transverse
longitudinal
bands
AuNRs
with
fluorescence
(FL)
spectra
CQDs.
Significant
FL
quenching
(turn-off)
their
recovery
(turn-on)
have
observed
etching
end-to-end
assemblies
lead
detection
biomolecules
like
H2O2,
glucose,
glutathione
(GSH),
acetylcholinesterase
(AChE).
The
redox
reaction
Au(0)
H2O2
results
in
decomposition
give
Au(I)
ions,
thereby
inducing
(turn-on).
interruption
FRET
phenomenon
production
from
glucose
oxidase
presence
a
thiol-containing
compound
acetylthiocholine
AChE
enzyme
causes
CQDs,
respectively.
Moreover,
assembly
leads
disruption,
turn-on
signals
found
be
measures
GSH.
In
comparison
UV–visible
approach,
measurements
through
process
are
more
sensitive
under
same
conditions.
practical
applicability
proposed
sensing
system
verified
human
plasma
samples.
Here,
a
rational
strategy
to
achieve
multifunctional
N,
S
codoped
carbon
dots
(N,
S-CDs)
is
reported,
aiming
improve
the
photoluminescence
quantum
yields
(PLQYs)
of
CDs.
The
synthesized
S-CDs
have
excellent
stability
and
emission
properties
independent
excitation
wavelength.
Through
introduction
element
doping,
fluorescence
CDs
red-shifted
from
430
545
nm,
corresponding
PLQYs
can
be
greatly
enhanced
11.2%
65.1%.
It
found
that
doping
elements
causes
an
increase
in
size
elevated
graphite
N
content,
which
may
key
factors
cause
redshift
emission.
Furthermore,
also
serves
suppress
nonradiative
transitions,
responsible
for
PLQYs.
Besides,
certain
solvent
effect
applied
detect
water
content
organic
solvents,
strong
sensitivity
alkaline
environment.
More
importantly,
used
"on-off-on"
dual
detection
mode
between
Zr4+
NO2-
.
In
addition,
combinedwith
polyvinylpyrrolidone
(PVP)
utilized
as
fluorescent
inks
anti-counterfeiting
applications.
Advanced Optical Materials,
Год журнала:
2023,
Номер
12(7)
Опубликована: Окт. 26, 2023
Abstract
Colloidal
carbon
dots
(C‐dots)
are
considered
as
promising
heavy‐metal‐free
materials
to
achieve
room‐temperature
phosphorescence
(RTP)
properties
for
applications,
such
photoelectronic
devices,
information
encryption,
and
bio‐imaging.
However,
most
of
the
current
obtained
RTP
C‐dots
have
a
short
lifetime
with
relatively
low
quantum
yield
(QY).
In
this
work,
large‐scale
synthesized
via
vacuum
heating
approach
multiple
emissions
(blue,
green,
yellow),
long
high
1.92
s,
QY
34.4%
by
selecting
different
types
precursors,
which
is
superior
reported
C‐dots.
The
atoms
doping
strong
bonding
between
neighbored
promoted
contributes
excellent
properties.
As
proof‐of‐concept,
as‐obtained
used
optical
ink
flexible
security
codes,
exhibiting
bright
shape
1.37
s.
This
work
offers
an
efficient
producing
high‐quality
C‐dots,
can
be
applied
anti‐counterfeiting
encryption
systems.
Advanced Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 18, 2024
Abstract
Carbon
dots
(CDs)
are
an
emerging
class
of
nanomaterials
with
attractive
optical
properties,
which
promise
to
enable
a
variety
applications.
An
important
and
timely
question
is
whether
CDs
can
become
functional
sustainable
alternative
incumbent
nanomaterials,
notably
inorganic
quantum
dots.
Herein,
the
current
CD
literature
comprehensively
reviewed
as
regards
their
synthesis
function,
focus
on
sustainability
aspects.
The
study
quantifies
why
it
that
be
synthesized
biomass
sole
starting
material
free
from
toxic
precious
metals
critical
raw
materials.
It
further
describes
analyzes
employed
pretreatment,
chemical‐conversion,
purification,
processing
procedures,
highlights
issues
usage
solvents,
energy
efficiency,
safety
waste
management.
specially
shown
many
reported
methods
concerningly
wasteful
utilization
non‐sustainable
solvents
energy.
finally
recommended
future
studies
should
explicitly
consider
discuss
environmental
influence
selected
material,
generated
byproducts,
quantitative
information
required
amounts
consumables,
provided
evaluation
presented
in
upscaled
context.
Chiral
CDots
(c-CDots)
not
only
inherit
those
merits
from
but
also
exhibit
chiral
effects
in
optical,
electric,
and
bio-properties.
Therefore,
c-CDots
have
received
significant
interest
a
wide
range
of
research
communities
including
chemistry,
physics,
biology,
device
engineers.
They
already
made
decent
progress
terms
synthesis,
together
with
the
exploration
their
optical
properties
applications.
In
this
review,
chiroptical
chirality
origin
extinction
circular
dichroism
(ECD)
circularly
polarized
luminescence
(CPL)
is
briefly
discussed.
Then,
synthetic
strategies
summarized,
one-pot
post-functionalization
ligands,
assembly
into
architectures
soft
templates.
Afterward,
on
applications
are
elaborated.
Research
domains
such
as
drug
delivery,
bio-
or
chemical
sensing,
regulation
enzyme-like
catalysis,
others
covered.
Finally,
perspective
challenges
associated
strategies,
understanding
chirality,
potential
provided.
This
review
discusses
latest
developments
helps
toward
better
structure-property
relationship
along
respective
