A
meta‐chemical
surface
is
being
patterned
via
dip‐pen
nanolithography
(DPN)
for
novel
electrochemical
heavy
metal
sensors.
The
unique
feature
of
DPN
allows
a
precise
transfer
desired
ink
onto
various
surfaces.
Two
kinds
sensors
are
developed,
which
differ
by
the
ligand
in
poly‐methyl
methacrylate
(PMMA)‐based
ink:
1,8‐diaminonaphthalene
(DAN)
and
D‐penicillamine
(D‐PA).
nanosize,
surface‐to‐volume
ratio
(18.6
23.1
μm
−1
DAN‐
D‐PA‐based
ink,
respectively),
binding
strength
between
cation
(2.21
−21.37
kcal
mol
respectively)
found
to
be
source
their
high
sensitivity,
with
limit
detection
values
0.40
0.30
ppb
DAN
D‐PA,
respectively.
According
DFT
calculations,
reactions
presence
PMMA
more
exergonic;
this
indicates
that
added
patterning
process
improves
metals
ligands.
This
enhanced
ligands
crucial
innovative
function
can
enhance
sensor
performance.
Ultrasonics Sonochemistry,
Год журнала:
2024,
Номер
105, С. 106858 - 106858
Опубликована: Март 24, 2024
Zinc
sulfide/graphitic
Carbon
Nitride
binary
nanosheets
were
synthesized
by
using
a
novel
sonochemical
pathway
with
high
electrocatalytic
ability.
The
as-
obtained
samples
characterized
various
analytical
methods
such
as
Transmission
Electron
Microscopy
(TEM),
Field
emission
scanning
electron
microscopy
(FESEM),
Energy-dispersive
X-ray
spectroscopy
(EDS),
diffraction
analysis
(XRD),
and
photoelectron
(XPS)
to
evaluate
the
properties
of
ZnS@CNS
this
new
route.
Subsequently,
electrical
electrochemical
performance
proposed
electrodes
EIS
CV
establish
an
electroactive
ability
nanocomposites.
complete
like
structural
physical
analyzed.
As-prepared
nanocomposite
was
applied
towards
detection
anticancer
drug
(flutamide)
cyclic
voltammetry
(CV),
differential
pulse
(DPV)
amperometry.
glassy
carbon
electrode
modified
composite
demonstrates
remarkable
efficiency
for
detecting
flutamide
in
pH
7.0
(PBS).
shows
synergistic
effect
ZnS
CNS
catalyst.
sensing
linear
range
improved
significantly
due
sites
rapid
transport
pathways.
Crucially,
method
successfully
demonstrated
biological
fluids
which
reveals
its
potential
real-time
applicability
drug.
ACS Applied Nano Materials,
Год журнала:
2024,
Номер
7(15), С. 17611 - 17620
Опубликована: Авг. 1, 2024
Cobalt
single-atom
nanozymes
(CoSAN)
are
demonstrated
as
excellent
nanomaterials
for
a
wide
range
of
electrochemical
applications.
Traditional
solution-based
synthesis
CoSAN
faces
challenges
such
multiple
steps,
extensive
washings,
and
high-temperature
annealing.
To
address
these
issues,
we
introduce
single-step
solid-state
using
laser
technology.
This
approach
facilitates
atomic
dispersion
cobalt
while
concurrently
generating
laser-scribed
graphene
(LSG)
nanosheets.
The
presence
Co
atoms
on
the
LSG
surface
is
confirmed
by
high-angle
annular
dark-field
scanning
transmission
electron
microscopy
(HAADF-STEM)
inductively
coupled
plasma-optical
emission
spectroscopy
(ICP-OES).
resulting
electrode
exhibits
electrocatalytic
sensing
performance
to
superoxide
anions
(O2•–),
providing
rapid
transfer
signal
amplification.
Elevated
levels
O2•–
serve
indicators
oxidative
stress,
which
associated
with
several
chronic
diseases.
sensor
achieves
high
sensitivity
low
detection
limits
determination
in
lab
samples,
human
serum
neuroblastoma
cells.
straightforward
method
outstanding
properties
suggest
significant
potential
biomedical
diagnostic
Advanced Materials Technologies,
Год журнала:
2025,
Номер
unknown
Опубликована: Фев. 8, 2025
Abstract
Nitrite
(NO
2
−
)
is
responsible
for
several
physiological
processes
but
can
be
harmful
in
excess.
With
rising
exposure
from
food
preservatives,
fertilizers,
and
pollutants,
accurate
nitrite
assessment
crucial
health
environmental
safety.
Different
methods
have
been
employed
its
determination,
with
electrochemical
sensors
showcasing
great
promise.
Single
atom
catalysts
(SACs)
are
a
class
of
nanomaterials
that
consists
isolated
catalytic
metal
atoms
anchored
on
conductive
supports,
which
exhibit
unique
electronic
properties
promise
this
application.
The
performance
these
materials
enhanced
even
more
by
incorporating
secondary
the
catalyst
structure.
This
leads
to
creation
surface‐active
sites
enables
facilitation
multi‐step
reactions.
Herein,
bimetallic
single
(FeCoSAN)
synthesized
through
step
laser
assisted
solid‐process
anchoring
iron
cobalt
while
simultaneously
creating
laser‐scribed
graphene
(LSG)
support.
presence
Fe
Co
verified
high‐angle
annular
dark‐field
scanning
transmission
electron
microscopy
(HAADF‐STEM)
X‐ray
absorption
spectroscopy
(XANES
EXAFS).
Through
testing,
system
demonstrated
excellent
capabilities
determination
NO
,
achieving
up
100%
efficiency,
comparison
bare
LSG,
detection
limit
2.42
µ
m
sensitivity
value
515.07
µA
−1
cm
−2
over
linear
range
5.0
1666
.
highlights
their
potential
vivo
point‐of‐care
sensing
applications.
