Journal of the American Ceramic Society,
Journal Year:
2024,
Volume and Issue:
107(7), P. 4949 - 4961
Published: March 31, 2024
Abstract
Lead‐free
potassium
sodium
niobate
(KNN)
ferroelectrics
have
emerged
as
promising
alternatives
to
lead‐based
materials
due
their
reduced
toxicity
and
sometimes
enhanced
properties.
The
opportunity
modify
the
ferroelectric
properties
by
doping,
nevertheless,
differs
from
ceramics.
A
much
lower
impact
with
increasing
dopant
concentration
was
observed.
This
study
systematically
investigates
differences
in
defect
chemistry
of
Na
0.475
K
Li
0.065
Nb
0.92
Ta
0.08
O
3
ceramics
through
iron
(Fe)
acceptor
doping
calcium
(Ca)
donor
at
varying
concentrations.
From
chemical
point
view,
it
becomes
evident
that
intrinsic
defects
on
electrical
exceeds
effect
extrinsic
induced
doping.
performance
donor‐doped
(Ca
2+
)
closely
resembles
undoped
KNN.
Thus,
hardly
any
change
conductivity
is
For
Fe‐doped
samples,
its
contribution
dielectric
loss
increased,
which
not
benefit
an
application
a
ferroelectric.
Therefore,
concepts
“softening”
“hardening”
are
incompatible
regularly
sintered
KNN
Sensors,
Journal Year:
2023,
Volume and Issue:
23(1), P. 543 - 543
Published: Jan. 3, 2023
Structural
health
monitoring
technology
can
assess
the
status
and
integrity
of
structures
in
real
time
by
advanced
sensors,
evaluate
remaining
life
structure,
make
maintenance
decisions
on
structures.
Piezoelectric
materials,
which
yield
electrical
output
response
to
mechanical
strain/stress,
are
at
heart
structural
monitoring.
Here,
we
present
an
overview
recent
progress
piezoelectric
materials
sensors
for
The
article
commences
with
a
brief
introduction
fundamental
physical
science
effect.
Emphases
placed
engineered
various
strategies
applications
Finally,
challenges
along
opportunities
future
research
development
high-performance
highlighted.
Small,
Journal Year:
2023,
Volume and Issue:
19(44)
Published: June 29, 2023
Abstract
Piezocatalysis
is
an
emerging
technique
that
holds
great
promise
for
the
conversion
of
ubiquitous
mechanical
energy
into
electrochemical
through
piezoelectric
effect.
However,
energies
in
natural
environment
(such
as
wind
energy,
water
flow
and
noise)
are
typically
tiny,
scattered,
featured
with
low
frequency
power.
Therefore,
a
high
response
to
these
tiny
critical
achieving
piezocatalytic
performance.
In
comparison
nanoparticles
or
1D
materials,
2D
materials
possess
characteristics
such
flexibility,
easy
deformation,
large
surface
area,
rich
active
sites,
showing
more
future
practical
applications.
this
review,
state‐of‐the‐art
research
progresses
on
their
applications
piezocatalysis
provided.
First,
detailed
description
offered.
Then
comprehensive
summary
presented
examines
various
fields,
including
environmental
remediation,
small‐molecule
catalysis,
biomedicine.
Finally,
main
challenges
prospects
discussed.
It
expected
review
can
fuel
application
piezocatalysis.
Advanced Functional Materials,
Journal Year:
2023,
Volume and Issue:
33(42)
Published: June 14, 2023
Abstract
The
development
of
high‐performance
(K,Na)NbO
3
(KNN)‐based
lead‐free
piezoceramics
for
next‐generation
electronic
devices
is
crucial
achieving
environmentally
sustainable
society.
However,
despite
recent
improvements
in
piezoelectric
coefficients,
correlating
their
properties
to
underlying
multiscale
structures
remains
a
key
issue
KNN‐based
ceramics
with
complex
phase
boundaries.
Here,
this
study
proposes
medium‐entropy
strategy
design
“local
polymorphic
distortion”
conjunction
the
construction
uniformly
oversize
grains
newly
developed
KNN
solid‐solution,
resulting
novel
large‐size
hierarchical
domain
architecture
(≈0.7
µm
wide).
Such
structure
not
only
facilitates
polarization
rotation
but
also
ensures
large
residual
polarization,
which
significantly
improves
piezoelectricity
(≈3.2
times)
and
obtains
giant
energy
harvesting
performance
(
W
out
=
2.44
mW,
P
D
35.32
µW
mm
−3
,
outperforming
most
piezoceramics).
This
confirms
coexistence
multiphase
through
atomic‐resolution
features
analyzes
domain/phase
transition
mechanisms
using
situ
electric
field
structural
characterizations,
revealing
that
induces
highly
effective
configuration
transitions
based
on
T–O–R
sequential
transitions.
demonstrates
new
designing
piezoceramic
materials
applications.
ACS Applied Materials & Interfaces,
Journal Year:
2023,
Volume and Issue:
15(12), P. 15636 - 15645
Published: March 17, 2023
Defect
engineering
is
a
proven
method
to
tune
the
properties
of
perovskite
oxides.
In
demanding
high-power
piezoelectric
ceramic
applications,
acceptor
doping
most
effective
harden
ceramics,
but
it
inevitably
degrades
ceramics'
electromechanical
properties.
Herein,
poling
based
on
doping,
namely,
high-temperature
poling,
implemented
by
applying
an
electric
field
above
Curie
temperature
for
achieve
balance
coefficient
d33
and
mechanical
quality
factor
Qm.
After
property
0.6
mol
%
Mn-doped
Pb0.92Sr0.08(Zr0.533Ti0.443Nb0.024)O3
=
483
pC/N
Qm
448.
Compared
with
traditional
ceramics
increased
approximately
40%,
also
nearly
18%.
Therefore,
high
were
exhibited
our
PZT
ceramics.
Rayleigh's
law
analysis,
XRD,
transmission
electron
microscopy
analysis
show
that,
after
considerably
related
large
increase
in
reversible
domain
wall
motion
intrinsic
effect,
while
slightly
inhibited
irreversible
extrinsic
effect.
This
study
reports
provides
insights
into
design
Angewandte Chemie International Edition,
Journal Year:
2023,
Volume and Issue:
63(1)
Published: Nov. 27, 2023
Photocatalytic
nitrogen
fixation
using
solar
illumination
under
ambient
conditions
is
a
promising
strategy
for
production
of
the
indispensable
chemical
NH3
.
However,
due
to
catalyst's
limitations
in
energy
utilization,
loss
hot
electrons
during
transfer,
and
low
adsorption
activation
capacity,
unsatisfactory
solar-to-chemical
conversion
(SCC)
efficiencies
most
photocatalysts
limit
their
practical
applications.
Herein,
cerium
oxide
nanosheets
with
abundant
strain-VO
defects
were
anchored
on
Au
hollow
nanomushroom
through
atomically
sharp
interfaces
construct
novel
semiconductor/plasmonic
metal
nanomushroom-like
heterostructure
(denoted
oxide-AD/Au).
Plasmonic
extended
absorption
light
from
visible
second
near-infrared
region.
The
superior
interface
greatly
enhanced
transfer
efficiency
electrons.
Abundant
induced
by
interfacial
compressive
strain
promoted
situ
nitrogen,
such
synergistic
promotion
VO
was
further
confirmed
density
functional
theory
calculations.
judicious
structural
defect
engineering
co-promoted
efficient
photofixation
oxide-AD/Au
heterostructures
SCC
0.1
%
simulated
AM
1.5G
illumination,
which
comparable
average
solar-to-biomass
natural
photosynthesis
typical
plants,
thus
exhibiting
significant
potential
as
new
candidate
artificial
photosynthesis.
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
36(2)
Published: July 15, 2023
Abstract
Atomically
thin
two‐dimensional
(2D)
oxide
crystals
have
garnered
considerable
attention
because
of
their
remarkable
physical
properties
and
potential
for
versatile
applications.
In
recent
years,
significant
advancements
been
made
in
the
design,
preparation,
application
ultrathin
2D
oxides,
providing
many
opportunities
new‐generation
advanced
technologies.
This
review
focuses
on
controllable
preparation
applications
electronic
optoelectronic
devices.
Based
bonding
nature,
various
types
are
first
summarized,
including
both
layered
nonlayered
crystals,
as
well
current
top‐down
bottom‐up
synthetic
approaches.
Subsequently,
terms
unique
electrical
advances
device
emphasized,
photodetectors,
field‐effect
transistors,
dielectric
layers,
magnetic
ferroelectric
devices,
memories,
gas
sensors.
Finally,
conclusions
future
prospects
presented.
It
is
hoped
that
this
will
provide
comprehensive
insightful
guidance
development
Advanced Materials,
Journal Year:
2023,
Volume and Issue:
36(6)
Published: Oct. 12, 2023
Abstract
Owing
to
low
immunogenicity‐induced
immune
escape
and
short‐term
circulating
responses,
the
efficiency
of
immunotherapy
is
unsatisfactory.
Therefore,
triggering
immunogenic
cell
death
establishing
a
long‐term,
mutually
reinforced
treatment
modality
are
urgent
challenges.
In
this
study,
ultrathin
CaBi
2
Nb
O
9
nanosheets
with
tunable
oxygen
vacancies
(abbreviated
as
CBNO‐OV1)
prepared
for
synergistic
necroptosis
immunotherapy.
The
optimized
vacancy
concentration
significantly
improves
piezoelectric
effect
under
ultrasound
irradiation,
thereby
considerably
improving
generation
reactive
species
(ROS).
Density
functional
theory
shows
that
can
improve
electron
hole
separation
by
suppressing
their
recombination,
thus
resulting
in
enhanced
piezocatalytic
activity.
Moreover,
permeability
tumor
membranes,
Ca
2+
influx.
Additionally,
CBNO‐OV1
also
releases
portion
,
which
induces
assisted
explosive
ROS.
Ribonucleic
acid
transcription
tests
suggest
mechanisms
associated
response
activation
necroptosis.
More
importantly,
trigger
significant
vivo,
activating
macrophage
M1
polarization
through
NF‐kappa
B
pathway
promoting
T‐cell
differentiation.Tumor
Necrosis
Factor‐α
differentiated
from
macrophages
conversely
promotes
necroptosis,
realizing
effect.
This
study
demonstrates
feasibility
amplifying
efficacy.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(6), P. 7444 - 7452
Published: Feb. 1, 2024
Potassium
sodium
niobate
(KNN)
lead-free
piezoceramics
have
garnered
significant
attention
for
their
environmentally
friendly
attributes,
desired
piezoelectric
activity
(d33),
and
high
Curie
temperature
(Tc).
However,
the
limited
applicability
of
most
KNN
systems
in
high-power
apparatus,
including
ultrasonic
motors,
transformers,
resonators,
persists
due
to
inherent
low
mechanical
quality
factor
(Qm).
Herein,
we
proposed
an
innovative
strategy
achieving
Qm
accompanied
by
desirable
d33
via
synergistic
chemical
doping
texturing
piezoceramics.
Comprehensive
electrical
measurements
along
with
quantitative
structural
characterization
at
multilength
scales
reveal
that
excellent
electromechanical
properties
(kp
=
0.58,
∼
134
pC·N-1,
582,
Tc
415
°C)
originate
from
<001>
degree,
nanodomain,
as
well
acceptor
hardening.
Our
findings
provide
insight
guidance
performance
KNN-based
piezoceramics,
which
were
expected
be
used
advanced
transducer
technology.
