As
a
highly
toxic
and
refractory
heavy
metal
contaminant,
Pb2+
has
seriously
endangered
human
health.
The
problems
of
low
sensitivity
high
cost
signal
labeling
often
exist
in
common
electrochemical
biosensor.
Herein,
biosensor
was
constructed
using
DNAzyme-driven
bipedal
DNA
walker
catalytic
hairpin
assembly
as
the
multistage
amplification
strategy.
Compared
with
Zr-MOF,
nanocomposite
material
gold
nanoparticle
@
zirconium-based
organic
framework
(AuNPs@Zr-MOF)
larger
porosity
specific
surface
area,
which
can
effectively
load
methylene
blue
to
amplify
current
signal.
presence
triggers
dual
reaction
gradually
accumulate
MB/AuNPs@Zr-MOF
on
electrode.
ingeniously
designed
sensing
strategy
enables
analysis
wide
linear
range
from
0.05
1000
nmol/L
lower
LOD
4.65
pmol/L.
In
addition,
sensor
strong
anti-interference
ability
accurately
detect
various
food
samples.
Sensors,
Год журнала:
2025,
Номер
25(7), С. 2334 - 2334
Опубликована: Апрель 7, 2025
We
developed
a
sensor
consisting
of
V2O5
nanorods
and
reduced
graphene
oxide
(rGO)
nanocomposite
(V2O5/rGO)
with
immobilized
DNA
aptamers
(Apt-NH@V2O5/rGO)
for
the
sensitive
electrochemical
detection
Hg
(II).
The
anchored
on
rGO
nanosheets
were
synthesized
using
hydrothermal
method.
was
analyzed
by
various
powerful
physical
methods
that
include
X-ray
diffraction
(XRD),
energy-dispersive
spectroscopy
(EDX),
field
emission
scanning
electron
microscopy
(FE-SEM),
Raman
spectroscopy,
Brunauer-Emmett-Teller
(BET)
method,
Fourier
transform
infrared
(FTIR).
FE-SEM
disclosed
nanorod-like
structure
uniform
anchoring
nanosheet.
Moreover,
BET
results
showed
V2O5/rGO
possesses
excellent
porosity.
Furthermore,
glassy
carbon
electrode
(GCE)
modified
Apt-NH@V2O5/rGO
used
Hg(II)
differential
pulse
voltammetry
(DPV).
aptasensor
exhibited
sensitivity
selectivity
toward
detection,
limit
(LOD)
5.57
nM,
which
is
below
maximum
permissible
established
WHO
rivers
(30
nM).
also
significant
stability
good
repeatability.
Micromachines,
Год журнала:
2025,
Номер
16(3), С. 275 - 275
Опубликована: Фев. 27, 2025
This
study
describes
the
direct
deposition
of
extremely
dense
TiO2
nanorods
(NRs)
on
an
ITO
substrate
for
improved
detection
heavy
metal
ions
(HMIs).
A
facile
hydrothermal
method
was
employed
to
synthesize
NRs
at
~130
°C.
Synthesized
were
analyzed
morphological,
structural,
and
electrochemical
properties.
As
electrode
material,
used
simultaneous
three
HMIs
(i.e.,
Cr3+,
Cu2+,
Hg2+),
which
showed
a
remarkably
high
sensitivity
~92.2
µA.mM−1.cm−2
Cu2+
ion.
Relatively
low
sensitivities
~15.6
~19.67
recorded
Cr3+
Hg2+
ions,
respectively.
The
fabricated
NR-based
HMI
sensor
effective
dynamic
linear
range
with
LOD
values
~21.7
mM,
37
~
28.5
mM
Hg2+,
exhibited
efficient
charge
transfer
over
toward
trace
Hg2+.
Moreover,
reliability
assessed,
promising
stability
30
days.
obtained
results
indicate
that
grown
are
material
detecting
hazardous
might
eventually
be
commercialized
in
near
future.
