Nano Letters,
Год журнала:
2024,
Номер
24(17), С. 5139 - 5145
Опубликована: Апрель 19, 2024
Dynamic
tuning
of
thermal
transport
in
solids
is
scientifically
intriguing
with
wide
applications
for
control
electronic
devices.
In
this
work,
we
demonstrate
a
transistor,
device
which
heat
flow
can
be
regulated
using
external
control,
realized
topological
insulator
(TI)
through
the
surface
states.
The
achieved
by
optical
gating
thin
dielectric
layer
deposited
on
TI
film.
gate-dependent
conductivity
measured
micro-Raman
thermometry.
transistor
has
large
ON/OFF
ratio
2.8
at
room
temperature
and
continuously
repetitively
switched
tens
seconds
potentially
much
faster
electrical
gating.
Such
transistors
fast
switching
times
offer
possibilities
smart
devices
active
management
future
systems.
Advanced Materials,
Год журнала:
2024,
Номер
36(24)
Опубликована: Март 2, 2024
Twisted
van
der
Waals
materials
featuring
Moiré
patterns
present
new
design
possibilities
and
demonstrate
unconventional
behaviors
in
electrical,
optical,
spintronic,
superconducting
properties.
However,
experimental
exploration
of
thermal
transport
across
has
not
been
as
extensive,
despite
its
critical
role
nanoelectronics,
management,
energy
technologies.
Here,
the
first
study
is
conducted
on
twisted
graphene,
demonstrating
a
phonon
polarizer
concept
from
rotational
misalignment
between
stacked
layers.
The
direct
acoustic
measurements,
structural
characterizations,
atomistic
modeling,
reveal
modulation
up
to
631%
conductance
with
various
angles,
while
maintaining
high
transmission.
By
comparing
experiments
density
functional
theory
molecular
dynamics
simulations,
mode-dependent
transmissions
are
quantified
based
angle
alignment
graphene
band
structures
attributed
coupling
among
flexural
modes.
agreement
confirms
dominant
tuning
mechanisms
adjusting
transmission
high-frequency
modes
having
negligible
effects
low-frequency
near
Brillouin
zone
center.
This
offers
crucial
insights
into
fundamental
structures,
opening
avenues
for
invention
quantum
devices
methodologies
manipulations
vibrational
spectra.
ACS Nano,
Год журнала:
2024,
Номер
18(42), С. 28531 - 28556
Опубликована: Окт. 12, 2024
Molecular
electronics
is
a
field
that
explores
the
ultimate
limits
of
electronic
device
dimensions
by
using
individual
molecules
as
operable
devices.
Over
past
five
decades
since
proposal
molecular
rectifier
Aviram
and
Ratner
in
1974
(
Chem.
Phys.
Lett.1974,29,
277−283),
researchers
have
developed
various
fabrication
characterization
techniques
to
explore
electrical
properties
molecules.
With
push
characterizations
data
analysis
methodologies,
reproducibility
issues
single-molecule
conductance
measurement
been
chiefly
resolved,
origins
variation
among
different
devices
investigated.
Numerous
prototypical
with
external
physical
chemical
stimuli
demonstrated
based
on
advances
instrumental
methodological
developments.
These
enable
functions
such
switching,
logic
computing,
synaptic-like
computing.
However,
goal
electronics,
how
can
molecular-based
intelligence
be
achieved
through
devices?
At
fiftieth
anniversary
we
try
answer
this
question
summarizing
recent
progress
providing
an
outlook
electronics.
First,
review
methodologies
for
junctions,
which
provide
foundation
Second,
preliminary
efforts
toward
integration
circuits
are
discussed
future
potential
intelligent
applications.
Third,
some
sensing
applications
introduced,
demonstrating
phenomena
at
scale
beyond
conventional
macroscopic
From
perspective,
summarize
current
challenges
prospects
describing
concepts
"AI
electronics"
"single-molecule
AI".
Abstract
Thermal
switches
that
switch
the
thermal
conductivity
(
κ
)
of
active
layers
are
attracting
increasing
attention
as
management
devices.
For
electrochemical
switches,
several
transition
metal
oxides
(TMOs)
proposed
layers.
After
redox
treatment,
crystal
structure
TMO
is
modulated,
which
results
in
switching.
However,
switching
width
still
small
(<4
W
m
−1
K
).
In
this
study,
it
demonstrates
LaNiO
x
‐based
solid‐state
have
a
4.3
.
Fully
oxidized
3
(on
state)
has
6.0
due
to
large
contribution
electron
ele
,
3.1
contrast,
reduced
2.72
(off
1.7
because
phonons
scattered
by
oxygen
vacancies.
The
cyclable
and
crystalline
lattice
This
may
be
promising
platform
for
next‐generation
devices
such
displays.
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 8, 2024
Abstract
Thermally
conductive
polymer
composites
hold
great
potential
for
thermal
management
applications
in
the
electronics
industry,
but
achieving
metal‐like
conductivity
(>200
W
m
−1
K
)
remains
challenging
due
to
inevitable
phonon
scattering
and
resistance
at
filler‐filler
filler‐matrix
interfaces.
Herein,
an
efficient
approach
is
presented
overcome
this
long‐standing
barrier
by
designing
a
densified
interconnecting
filler
framework,
featuring
macro‐level
carbon
fiber
(CF)
array
welded
with
high‐quality,
self‐assembled
graphene
network.
In
vertically
aligned
continuous
CFs
function
as
primary
through‐plane
conduction
paths,
minimizing
resistance.
Meanwhile,
secondary
network
interconnects
into
more
integrated
framework
while
introducing
supplementary
paths.
Following
backfilling,
resulting
epoxy
nanocomposite
exhibits
unprecedented
of
262
loading
23.3
vol%,
establishing
new
benchmark
among
thermally
conducting
composites.
When
employed
interface
material,
composite
offers
68.2%
enhancement
cooling
efficiency
compared
standard
commercial
counterparts.
Furthermore,
functional
presents
excellent
Joule
heating
interfacial
adhesion
properties,
making
it
promising
healing
multifunctional
complex
environments.
RSC Advances,
Год журнала:
2025,
Номер
15(14), С. 10565 - 10572
Опубликована: Янв. 1, 2025
The
field
of
molecular
logic
gates
began
thirty
years
ago
with
the
early
pioneers
de
Silva
et
al.
laying
foundation
for
modern
molecular-scale
switches
and
devices.
Journal of the American Ceramic Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Апрель 12, 2025
Abstract
Boosting
heat
transfer
of
ceramics
has
been
an
increasing
challenge
for
spacecraft
insulation
tile.
The
concurrent
superiorities
higher
stability
and
comparative
thermal
conductivity
on
par
with
graphene
make
boron
nitride
(h‐BN)
ideal
reinforcement.
Yet,
its
characteristic
Kapitza
resistance
inevitably
aggravates
deterioration
in
aerodynamic
in‐service
environment.
Here,
we
proposed
a
multiscale
optimal
approach
to
boost
the
Al
2
O
3
/h‐BN
composites
nanoscale
interfacial
conductance
mesoscale
h‐BN
ordered
conformation.
Interfacial
induced
by
strong
5%
Al‐N
bonding
configuration
densification
process
is
improved
from
248
MW·m
−2
·K
−1
at
300
K
340
1500
K,
which
depicts
priority
than
composites.
Massive
delocalized
lower‐frequency
phonons,
indicator
flutter,
are
decomposed
localized
high‐frequency
phonon
high
temperature.
Mesoscale
increased
15
W·m
random
distribution
19
conformation
K.
This
design
external
field
fabrication
constructs
rapid
path
anisotropic
converge,
ameliorates
dispersion.
work
provides
effective
strategy
designing
novel
ceramic
tile
extend
remaining
life
next‐generation
spacecraft.
