Nanotechnology,
Journal Year:
2023,
Volume and Issue:
34(32), P. 325501 - 325501
Published: May 10, 2023
Metal
organic
frameworks
are
an
attractive
platform
to
develop
fascinating
electrocatalysts
for
the
oxidation
of
ascorbic
acid
(AA),
and
their
different
morphologies
have
been
hinted
in
literature
impact
sensing
performance.
In
this
work,
by
varying
reaction
medium
metal
source
ligand,
copper
2-hydroxybenzene-1,4-dicarboxylate
(CuBDC-OH)
nanosheets
(NSs),
nanorods
(NRs)
bulk
were
generated.
Thereinto,
CuBDC-OH-NSs
displayed
highest
sensitivity
151.99μA
mM-1cm-2in
linear
range
12-1074μM,
which
is
1.5
times
greater
than
that
CuBDC-OH
NRs
3.5
bulk.
The
electrochemical
analyzes
manifested
superiority
originated
from
higher
oxidative
current,
larger
active
surface
area
lower
charge
transfer
resistance,
enabling
efficient
electro-oxidation
AA.
Additionally,
satisfactory
selectivity,
stability
reproducibility
obtained.
Electrochemistry Communications,
Journal Year:
2023,
Volume and Issue:
159, P. 107639 - 107639
Published: Dec. 12, 2023
In
the
present
research,
ZnO@TiO2
nanoparticles
(ZnO@TiO2
NPs)
was
synthesized
by
using
a
simple
method
and
results
of
infrared
(IR),
X-ray
diffraction
(XRD),
field
emission
scanning
electron
microscope
(FE-SEM),
energy-dispersive
spectroscopy
(EDX)
confirmed
their
synthesis.
Then,
an
electrochemical
sensor
based
on
screen
printed
graphite
electrode
(SPGE)
modified
with
NPs
developed
for
voltammetric
detection
hydrazine
in
water
samples.
The
SPGE
demonstrates
significant
performance
toward
due
to
synergistic
effect
between
ZnO
TiO2
it
proved
from
cyclic
voltammetry
(CV).
Also,
observation
oxidation
peak
without
reduction
opposite
scan
direction
indicated
irreversibility
both
bare
ZnO@TiO2/SPGE.
Under
optimized
conditions
(pH
differential
pulse
parameters),
current
response
at
ZnO@TiO2/SPGE
showed
linear
dependence
concentration,
ranging
0.01
µM
585.0
limit
(LOD)
0.005
µM.
addition,
pertinency
practical
applications
investigated
quantification
findings
recovery
values
97.3%
104.2%
relative
standard
deviations
(RSDs)
≤
3.5%
river
tap
Heliyon,
Journal Year:
2025,
Volume and Issue:
11(3), P. e42438 - e42438
Published: Feb. 1, 2025
Research
Highlights✓The
Pt-Ag@Cu-BDC
MOF
nanocomposite
was
prepared
by
solvothermal
method
and
galvanic
replacement
reaction.✓The
composite
utilized
as
a
modifier
to
decorate
glassy
carbon
electrode✓The
MOF/GCE,
an
electrochemical
sensor
used
trace
detection
of
Imidacloprid.✓The
mechanism
Imidacloprid
reduction
investigated
using
Tafel
analysis
Nicholson
equation.AbstractThe
key
factor
improve
the
sensitivity
sensors
for
direct
detection,
is
introduction
new
nanomaterials
with
enhanced
catalytic
properties.
Accordingly,
we
Pt-Ag@Cu-metal
organic
framework
(MOF)
novel
construct
sensitive
voltammetric
determination
imidacloprid
(IMI).
The
copper
benzene-1,4-dicarboxylate
(Cu-BDC
MOF)
support
bearing
metal
nanoparticles
(NPs)
including
Ag
Pt.
First,
NPs
were
incorporated
into
Cu-BDC
then
Pt
substitute
through
reaction
between
ions.
(GC)
electrode.
excellent
conductivity,
hierarchical
micro-mesoporous
structure
synergistic
effect
beneficial
fast
electron
transfer
required
IMI
reduction.
At
potential
greatly
shifted
positive
value
signal
increased
significantly.
exhibited
wide
linear
range
(5nM-10000
nM),
low
limit
(1.5
nM)
high
towards
detection.
This
successfully
applied
in
citrus
juice
water
samples
good
recoveries
(92–106%,
RSD
≤
4
%).Graphical
abstract
