Nanomaterials,
Год журнала:
2024,
Номер
14(23), С. 1920 - 1920
Опубликована: Ноя. 28, 2024
Though
much
progress
has
been
achieved
in
the
discovery
of
new
molecular
ferroelectrics
recent
years,
practical
applications
and
related
physics
are
still
rarely
explored
due
to
difficulty
high-quality
film
production
patterning
issues.
Single-crystalline
films
patterns
high
demand
for
device
performance.
Through
a
template-assisted
space-confined
strategy,
herein,
ordered
single-crystalline
nanowire
optoelectronic
devices
semiconducting
ferroelectric
(SMF),
hexane-1,6-diammonium
pentaiodobismuth
(HDA-BiI
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Фев. 17, 2024
Abstract
Tuning
phase
transition
temperature
is
one
of
the
central
issues
in
materials.
Herein,
we
report
a
case
study
using
enantiomer
fraction
engineering
as
promising
strategy
to
tune
Curie
(
T
C
)
and
related
properties
ferroelectrics.
A
series
metal-halide
perovskite
ferroelectrics
S
−3AMP)
x
R
1−x
PbBr
4
was
synthesized
where
3AMP
3-(aminomethyl)piperidine
divalent
cation
varies
between
0
1
(0
=
enantiomers;
0.5
racemate).
With
change
fraction,
,
second-harmonic
generation
intensity,
degree
circular
polarization
photoluminescence,
photoluminescence
intensity
materials
have
been
tuned.
Particularly,
when
0.70
−
1,
continuously
linear
tuning
achieved,
showing
tunable
range
about
73
K.
This
provides
an
effective
means
insights
for
regulating
chiroptical
functional
Journal of the American Chemical Society,
Год журнала:
2024,
Номер
146(9), С. 6336 - 6344
Опубликована: Фев. 21, 2024
Actuating
materials
convert
different
forms
of
energy
into
mechanical
responses.
To
satisfy
various
application
scenarios,
they
are
desired
to
have
rich
categories,
novel
functionalities,
clear
structure-property
relationships,
fast
responses,
and,
in
particular,
giant
and
reversible
shape
changes.
Herein,
we
report
a
phase
transition-driven
ferroelectric
crystal,
(
Advanced Functional Materials,
Год журнала:
2024,
Номер
34(28)
Опубликована: Март 10, 2024
Abstract
Multiferroics
refer
to
materials
with
two
or
more
ferroic
orders
in
one
phase
within
a
specific
temperature
range,
including
ferroelectricity,
ferroelasticity,
and
ferromagnetism
which
have
been
widely
used
sensors,
actuators,
memory
devices.
Among
them,
hybrid
perovskites
exhibiting
multiferroicity
are
generally
limited
low
dimensions
(0D–2D).
Designing
3D
lead‐free
perovskite
multiferroics
remains
challenge
due
Goldschmidt's
tolerance
factor
limitation.
Here,
multiferroic
(
R
‐3AP)RbBr
3
1
;
3AP
=
3‐ammoniopyrrolidinium)
is
successfully
synthesized
by
introducing
homochirality
the
ferroelectric
Rac
,
achieving
both
ferroelasticity
ferroelectricity.
Compound
undergoes
structure
transition
at
401
K
belonging
Aizu
notation
432F2(
s
),
has
12
equivalent
polarization
directions
6
polar
axes.
Furthermore,
exhibits
reversible
second
harmonic
generation
switching
effects.
Moreover,
while
varies,
rapid
changes
of
ferroelastic
domains
observed
using
polarizing
microscope,
indicating
that
it
material.
This
work
provides
practical
method
for
designing
synthesizing
molecule‐based
multiferroics.
Inorganic Chemistry Frontiers,
Год журнала:
2024,
Номер
11(15), С. 4611 - 4618
Опубликована: Янв. 1, 2024
The
first
polar
2D
lead-free
hybrid
perovskite
(4BrPEA)
3
BiI
6
was
synthesized
by
reducing
the
occupancy
rate
of
Bi
3+
ions,
and
self-powered
polarization-sensitive
photodetector
achieved
a
large
photocurrent
anisotropy
factor
2.16.
Abstract
Due
to
the
built‐in
electric
field
induced
by
spontaneous
polarization
in
hybrid
perovskite
(HP)
ferroelectrics,
devices
based
on
them
exhibit
excellent
performance
self‐powered
photodetection.
However,
most
of
photodetector
are
made
lead‐based
HP
ferroelectrics
and
have
a
relatively
narrow
photoresponse
waveband.
Although
lead‐free
HPs
solve
problem
lead
toxicity,
their
optoelectronic
is
inferior
that
waveband
limited
its
optical
band
gap,
which
hinders
further
application.
To
this
problem,
herein,
ferroelectric
(HDA)BiI
5
(HDA
hexane‐1,6‐diammonium)
with
large
shows
an
enhanced
photocurrent
achieves
x‐ray‐ultraviolet–visible‐near‐infrared
(x‐ray‐UV–Vis–NIR)
through
ferro‐pyro‐phototronic
(FPP)
effect.
The
ferroelectric,
pyroelectric,
photovoltaic
characteristics
coupled
together
single‐phase
effective
way
improve
devices.
What
particularly
attractive
FPP
effect
not
only
improves
,
but
also
broadband
photoresponses
beyond
absorption
range.
Especially,
current
boosting
exceptional
contrast
~1100%
2400%
under
520
637
nm,
respectively,
associated
Meanwhile,
single
crystal
significant
effects
even
high‐energy
x‐ray,
owns
outstanding
sensitivity
170.7
μC
Gy
−1
cm
−2
lower
detection
limit
266
nGy
s
at
0
V
bias.
Therefore,
it
great
significance
study
coupling
multiple
physical
device
ferroelectrics.
image
Inorganic Chemistry,
Год журнала:
2023,
Номер
62(32), С. 12634 - 12638
Опубликована: Авг. 3, 2023
A
two-dimensional
(2D)
organic-inorganic
hybrid
perovskite
(OIHP)
material
with
out-of-plane
ferroelectricity
is
the
key
to
miniaturization
of
vertical-sandwich-type
ferroelectric
optoelectronic
devices.
However,
2D
OIHP
ferroelectrics
polarization
are
still
scarce,
and
effective
design
strategies
lacking.
Herein,
we
report
a
novel
Dion-Jacobson
semiconductor
synthesized
by
rigid-to-flexible
cationic
tailoring
strategy,
achieving
an
1.7
μC/cm2
high
photoresponse.
Integrating
excellent
photoelectric
properties
affords
promising
platform
investigate
ferroelectricity-related
effects
in
vertical
Inorganic Chemistry Frontiers,
Год журнала:
2023,
Номер
10(17), С. 5035 - 5043
Опубликована: Янв. 1, 2023
A
unique
cationic
assembly
via
strong
H-bonding
interacts
intensely
with
perovskite
inorganic
sheets
to
bring
about
huge
in-plane
structural
anisotropy
that
leads
high
photocurrent
responses.
ACS Materials Letters,
Год журнала:
2023,
Номер
6(1), С. 203 - 211
Опубликована: Дек. 14, 2023
Phase-change
materials
(PCMs)
have
spurred
intensive
studies
for
information
storage
owing
to
huge
and
drastic
changes
in
physical
properties
(i.e.,
optical
resistivity)
during
the
phase
transitions
between
crystalline-amorphous
crystalline-melting-glassy
states.
However,
limited
switching
greatly
hinder
their
development
applications.
Herein,
we
report
a
pair
of
hybrid
metal
halides
(R/S-2-HMM)3SbCl6
(2-HMM
=
2-(hydroxymethyl)morpholine
cation)
as
model
compounds
new
class
photoluminescent
PCMs.
They
undergo
stable
melt
process
become
amorphous
glass
by
melt-quenching.
The
crystalline
exhibits
near-unity
yellow
photoluminescence
with
95%
quantum
yield
due
radiative
recombination
self-trapped
excitons
excited
state
[SbCl6]3–
octahedra.
an
orange
emission
very
low
good
transparency
400–800
nm
range.
Drastic
via
crystal-glass
transition
is
exploited
rewritable
phase-change
memory,
exemplified
4
×
array
device.
robust
crystal–liquid–glass
open
avenue
PCMs
further
applications
remote
storage,
sensing,
display.
