A graphene-based toxic detection approach
Memories - Materials Devices Circuits and Systems,
Journal Year:
2025,
Volume and Issue:
unknown, P. 100127 - 100127
Published: Feb. 1, 2025
Language: Английский
Interface-Tailored Secondary Excitation and Ultrafast Charge/Energy Transfer in Ti3C2Tx-MoS2 Heterostructure Films
Journal of the American Chemical Society,
Journal Year:
2025,
Volume and Issue:
unknown
Published: March 7, 2025
Charge/energy
separation
across
interfaces
of
plasmonic
materials
is
vital
for
minimizing
losses
and
enhancing
their
performance
in
photochemical
optoelectronic
applications.
While
heterostructures
combining
two-dimensional
transition
metal
carbides/nitrides
(MXenes)
semiconducting
dichalcogenides
(TMDs)
hold
significant
potential,
the
mechanisms
governing
plasmon-induced
carrier
dynamics
at
these
remain
elusive.
Here,
we
uncover
a
distinctive
secondary
excitation
phenomenon
an
ultrafast
charge/energy
transfer
process
heterostructure
films
composed
macro-scale
Ti3C2Tx
MoS2
films.
Using
Rayleigh–Bénard
convection
Marangoni
effect-induced
self-assembly,
fabricate
large-scale
(square
centimeters)
edge-connected
monolayer
nanoflakes.
These
are
flexibly
stacked
controlled
sequence
to
form
macroscopic
heterostructures,
enabling
investigation
manipulation
excited-state
using
transient
absorption
optical
pump-terahertz
probe
spectroscopy.
In
Ti3C2Tx-MoS2
heterostructure,
observe
driven
by
surface
plasmon
resonance
Ti3C2Tx.
This
phenomenon,
with
characteristic
rise
time
constant
∼70
ps,
likely
facilitated
acoustic
phonon
recycling
interface.
Further
interfacial
thermal
transport
engineering─achieved
tailoring
combination
trilayer
heterostructures─allows
extending
∼175
ps.
Furthermore,
identify
sub-150
fs
from
MoS2.
The
efficiency
strongly
dependent
on
photon
energy,
resulting
amplified
photoconductivity
up
∼180%
under
3.10
eV
excitation.
insights
crucial
developing
MXene-based
paving
way
advancements
Language: Английский
From Pollutant Removal to Renewable Energy: MoS2-Enhanced P25-Graphene Photocatalysts for Malathion Degradation and H2 Evolution
Cristian Martínez-Perales,
No information about this author
Abniel Machín,
No information about this author
Pedro J. Berríos-Rolón
No information about this author
et al.
Materials,
Journal Year:
2025,
Volume and Issue:
18(11), P. 2602 - 2602
Published: June 3, 2025
The
widespread
presence
of
pesticides—especially
malathion—in
aquatic
environments
presents
a
major
obstacle
to
conventional
remediation
strategies,
while
the
ongoing
global
energy
crisis
underscores
urgency
developing
renewable
sources
such
as
hydrogen.
In
this
context,
photocatalytic
water
splitting
emerges
promising
approach,
though
its
practical
application
remains
limited
by
poor
charge
carrier
dynamics
and
insufficient
visible-light
utilization.
Herein,
we
report
design
evaluation
series
TiO2-based
ternary
nanocomposites
comprising
commercial
P25
TiO2,
reduced
graphene
oxide
(rGO),
molybdenum
disulfide
(MoS2),
with
MoS2
loadings
ranging
from
1%
10%
weight.
photocatalysts
were
fabricated
via
two-step
method:
hydrothermal
integration
rGO
into
followed
solution-phase
self-assembly
exfoliated
nanosheets.
composites
systematically
characterized
using
X-ray
diffraction
(XRD),
Raman
spectroscopy,
transmission
electron
microscopy
(TEM),
UV-Vis
diffuse
reflectance
spectroscopy
(DRS),
photoluminescence
(PL)
spectroscopy.
Photocatalytic
activity
was
assessed
through
two
key
applications:
degradation
malathion
(20
mg/L)
under
simulated
solar
irradiation
hydrogen
evolution
in
sacrificial
agents.
Quantification
performed
gas
chromatography–mass
spectrometry
(GC-MS),
thermal
conductivity
detection
(GC-TCD).
Results
showed
that
significantly
enhanced
surface
area
mobility,
served
an
effective
co-catalyst,
promoting
interfacial
separation
acting
active
site
for
evolution.
Nearly
complete
(~100%)
achieved
within
hours,
production
reached
up
6000
µmol
g−1
h−1
optimal
loading.
Notably,
performance
declined
higher
content
due
recombination
effects.
Overall,
work
demonstrates
synergistic
enhancement
provided
stable
P25-based
system
viability
addressing
both
environmental
sustainable
conversion
challenges.
Language: Английский