ACS Sensors,
Год журнала:
2022,
Номер
7(9), С. 2750 - 2758
Опубликована: Сен. 13, 2022
As
a
marker
molecule
in
respiratory
gases
for
the
pulmonary
disease
asthma,
nitric
oxide
(NO)
has
attracted
much
attention
real-time
gas
monitoring.
However,
low
sensitivity,
poor
selectivity,
and
high
operating
temperature
limit
practical
applications
of
metal
semiconductor
(MOS)
based
chemiresistor
sensors.
Herein,
by
deliberately
introducing
metal-organic
frameworks
(MOFs)
free-standing
TiO2
nanochannels
(NCs),
sensor
with
excellent
detection
ability
outstanding
selective
traits
is
developed
sensing
NO
at
room
(RT).
The
precisely
engineered
Cu(II)-based
MOF
Cu-TCA
(H3TCA
=
tricarboxytriphenyl
amine)
induces
more
active
surface
NCs,
causing
buildup
CuTCA/TiO2
p-n
heterojunctions
that
improve
response
RT
just
via
simple
UV
irradiation
(λ
365
nm).
Importantly,
specialized
reductive
reaction
Cu(II)
enables
remarkable
selectivity
toward
analysis.
Owing
to
synergistic
large
chemical
sensitization
effects
from
Cu-TCA,
resulting
Cu-TCA/TiO2
NCs
show
performance;
i.e.,
((Rgas
-
Rair)/Rair)
reaches
124%
50
ppm
140
ppb
RT.
In
addition,
time
decreases
25.6%
if
system
subjected
irradiation.
as-formed
membrane
also
demonstrated
be
practically
effective
flexible
wearable
devices
quantitative
This
study
facilitates
use
MOFs
achieve
synergistically
enhanced
sensitivity
develop
high-performance
ACS Sensors,
Год журнала:
2021,
Номер
6(9), С. 3387 - 3397
Опубликована: Авг. 31, 2021
Hydrogen
sulfide
(H2S)
is
an
extremely
hazardous
gas
and
harmful
to
human
health
the
environment.
Here,
we
developed
a
flexible
H2S
gas-sensing
device
operated
at
room
temperature
(25
°C)
based
on
CuO
nanoparticles
coated
with
free-standing
TiO2-nanochannel
membranes
that
were
prepared
by
simple
electrochemical
anodization.
Benefiting
from
modulated
conductivity
of
CuO/TiO2
p–n
heterojunction
unique
nanochannel
architecture,
traditional
thermal
energy
was
innovatively
replaced
UV
irradiation
(λ
=
365
nm)
provide
required
for
triggering
sensing
reactions
H2S.
Importantly,
upon
exposure
H2S,
destroyed
newly
formed
ohmic
contact
forms
antiblocking
layer
interface
CuS
TiO2,
thus
making
active
temperature.
The
resulting
membrane
exhibited
notable
detection
sensitivity
featuring
minimum
limit
3.0
ppm,
response
value
46.81%
against
100
ppm
gas,
rapid
recovery
time.
This
also
demonstrated
excellent
durability,
long-term
stability,
wide-range
concentration
up
400
in
presence
40%
humidity
as
well
outstanding
flexibility
negligible
change
electrical
measurements
under
various
mechanical
stability
tests.
study
not
only
provides
new
strategy
design
sensor
but
paves
universal
platform
sensitive
sensing.
Journal of the American Chemical Society,
Год журнала:
2021,
Номер
143(37), С. 15145 - 15151
Опубликована: Сен. 8, 2021
Rapid
and
specific
identification
of
tumor
metabolic
markers
is
great
significance.
Herein,
a
convenient,
reliable
strategy
was
proposed
to
screen
prostate
cancer
(PCa)
individuals
through
indirectly
quantifying
sarcosine,
an
early
indicator
PCa,
in
the
clinical
urine
samples.
The
success
roots
rational
design
cascade
response
model,
which
takes
integrated
sarcosine
oxidase
(SOX)
as
recognition
unit
oxygen-sensitive
molecule
signal
reporter.
newly
developed
hierarchical
mesoporous
Zr-based
metal–organic
frameworks
with
continuously
tunable
mesopore
size
ensure
synergetic
work
SOX
spatially
separated
their
neighboring
microporous
domains,
respectively.
large
up
12.1
nm
not
only
greatly
enhances
loading
capacity
but
also
spares
enough
space
for
free
diffusion
sarcosine.
On
this
basis,
probe
competent
specifically
check
out
tiny
concentration
change
sample
between
PCa
patients
healthy
humans.
Such
concept
enzyme-assisted
substrate
sensing
could
be
simply
extended
by
altering
type
immobilized
enzymes,
hopefully
setting
guideline
multiple
probes
quantify
biomarkers
complex
biological
ACS Applied Materials & Interfaces,
Год журнала:
2021,
Номер
13(30), С. 36106 - 36116
Опубликована: Июль 27, 2021
Metal–organic
frameworks
(MOFs)
are
significant
useful
molecular
materials
as
a
result
of
their
high
surface
area
and
flexible
catalytic
activities
by
tuning
the
metal
centers
ligands.
MOFs
have
attracted
great
attention
efficient
nanozymes
recently;
however,
it
is
still
difficult
to
understand
polymetallic
for
enzymatic
catalysis
because
complicated
structure
interactions.
Herein,
bimetallic
NiFe2
MOF
octahedra
were
well
prepared
exhibited
enhanced
peroxidase-like
activities.
The
synergistic
effect
Fe
Ni
atoms
was
systematically
investigated
electrochemistry,
X-ray
photoelectron
spectrometry,
(XPS)
in
situ
Raman
techniques.
electrons
tend
transfer
from
Ni2+
Fe3+
MOFs,
resulting
Fe2+
ready
decompose
H2O2
generate
·OH
Fenton-like
reaction.
After
integration
with
glucose
oxidase
(GOx),
which
can
downgrade
pH
value
oxidation
glucose,
self-activated
cascade
reagent
therefore
established
efficiently
inducing
cell
death.
changes
morphology,
DNA,
protein
also
successfully
recorded
during
death
process
spectroscopy
fluorescence
imaging.
