Multiscale Covalent Organic Framework (COF) Films for Task-Specific Sensing in Multicomponent Gases
Chengyue Yu,
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Lingyun Xu,
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Fanrong Zhao
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et al.
ACS Materials Letters,
Journal Year:
2024,
Volume and Issue:
unknown, P. 5454 - 5478
Published: Nov. 18, 2024
Gas
sensing
is
vital
for
ecological
protection
in
agriculture,
early
disease
diagnosis
biomedicine,
and
safety
industrial
production.
Covalent
organic
frameworks
(COFs),
a
new
class
of
porous
polymer
materials,
can
be
customized
through
specific
ligand
selection
to
tailor
pore
sizes
active
sites,
enabling
them
selectively
enrich
interact
with
targeted
gas
molecules,
making
promising
candidates
sensing.
To
advance
their
use
this
field,
it
essential
investigate
the
mechanisms
complex
interactions
between
COFs
target
molecules
as
well
improve
COF
film
fabrication
methods.
This
review
outlines
design
strategies
films
across
multiscale:
molecular
interaction
mechanisms,
macroscopic
interfacial
synthesis
methods,
microscale/nanoscale
approaches
such
double-layer
filtration
micro/nanostructured
improved
transfer.
Finally,
several
key
research
directions
are
proposed
suitability
COF-based
materials
environments.
Language: Английский
Rational MOF Membrane Design for Gas Detection in Complex Environments
Lei Kong,
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Chengyue Yu,
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Yupeng Chen
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et al.
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 23, 2024
Abstract
Metal‐organic
frameworks
(MOFs)
hold
significant
promise
in
the
realm
of
gas
sensing.
However,
current
understanding
their
sensing
mechanisms
remains
limited.
Furthermore,
large‐scale
fabrication
MOFs
is
hampered
by
inadequate
mechanical
properties.
These
two
challenges
contribute
to
sluggish
development
MOF‐based
gas‐sensing
materials.
In
this
review,
selection
metal
ions
and
organic
ligands
for
designing
first
presented,
deepening
interactions
between
different
ions/organic
target
gases.
Subsequently,
typical
interfacial
synthesis
strategies
(gas‐solid,
gas‐liquid,
solid‐liquid
interfaces)
are
provided,
highlighting
potential
constructing
MOF
membranes
on
superhydrophobic
and/or
superhydrophilic
substrates.
Then,
a
multi‐scale
structure
design
proposed,
including
multi‐dimensional
membrane
heterogeneous
design,
improve
performance
through
enhanced
mass
transfer
specific
sieving.
This
strategy
anticipated
augment
task‐specific
capabilities
materials
complex
environments.
Finally,
several
key
future
research
directions
outlined
with
aim
not
only
further
investigate
underlying
principles
but
also
achieve
efficient
detection
gases
amidst
interfering
elevated
moisture
levels.
Language: Английский
Hammerhead Shark‐Inspired Microvillus‐Structured Ionic Elastomers for Wet Gas Sensing Based on Solvated Ion Transport
Chunyan Li,
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Hongyang Liu,
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Lingyun Xu
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et al.
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 13, 2025
Abstract
Water
molecules
are
ubiquitous
disruptors
of
conventional
gas
sensing
materials,
often
leading
to
diminished
performance
in
materials
that
reliant
on
electronic
signal
transmission.
This
creates
the
pressing
need
for
efficient
with
anti‐humidity
interference
properties.
Here,
a
hammerhead
shark‐inspired
microvillus‐structured
ionic
elastomer
based
transmission
nanoconfined
space
is
constructed
by
incorporating
liquids
into
polymer
matrix.
The
elastomers
optimized
microvillus
structure
demonstrated
1.68‐fold
higher
response
than
flat
ones,
short
time
(9
s)
toward
30
ppm
triethylamine
(TEA),
excellent
selectivity
and
low
limit
detection
(LOD)
(104.56
ppb).
Such
serves
as
proof‐of‐concept
effectively
combining
solvated
ion
transport
design
develop
advanced
systems.
With
such
an
evident
(23.52%),
similar
(12
s),
LOD
(498.05
ppb),
long‐term
stability
(at
least
days)
achieved
at
relative
humidity
70%.
Mechanistic
investigations
revealed
effective
ions
facilitated
after
sequential
water
TEA
surroundings
while
significantly
enhanced
transport.
Furthermore,
utility
system
shrimp
decay
monitoring
under
wet
conditions.
Language: Английский
Enhanced Oxygen Vacancy Formation in Pt-WO3 via W–OH Bond Cleavage Using Water-Based One-Step Electrospinning for High-Performance Gas Sensors
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 27, 2025
Oxygen
vacancies
play
a
crucial
role
in
charge
transport
and
surface
states
semiconductor
metal
oxides,
significantly
influencing
various
research
fields,
such
as
photocatalysis
gas
sensor.
Developing
effective
strategies
to
generate
oxygen
thereby
enhance
device
performance
is
highly
desirable.
In
this
study,
we
proposed
water-based
one-step
electrospinning
method
introduce
hydroxyl
groups,
leading
the
synthesis
of
Pt-decorated
WO3
nanofibers
(Pt-WO3(H2O))
with
increased
vacancies.
Density
functional
theory
calculations
revealed
that
dissociation
energy
W-OH
lower
than
W-O
bonds,
promoting
formation
via
bond
cleavage.
These
reduced
adsorption
acetone
on
surface,
enhancing
interactions.
Consequently,
Pt-WO3(H2O)
sensor
exhibited
an
ultrahigh
response
82
1.8
ppm
at
300
°C,
which
was
about
1
order
magnitude
higher
one
fabricated
by
conventional
electrospinning.
findings
indicate
technique
for
generating
oxide
nanofibers.
Our
high-performance
sensor,
capable
detecting
low
concentrations,
holds
great
potential
applications
noninvasive
health
screening.
Language: Английский
Nanomaterials‐Enabled Sensors for Detecting and Monitoring Chemical Warfare Agents
Small,
Journal Year:
2024,
Volume and Issue:
21(9)
Published: Dec. 26, 2024
Despite
their
restrictions
under
international
treaties,
many
chemical
warfare
agents
(CWAs)
and
toxic
analogues
are
still
used
in
various
industrial
sectors
such
as
agriculture
manufacturing.
Thus,
the
need
for
sensitive
selective
CWA
detection
remains
critical.
Commercially
available
methods,
while
accurate,
often
bulky,
expensive,
require
specialized
personnel.
Sensors
incorporating
nanomaterials
present
a
promising
alternative,
offering
rapid,
portable,
cost-effective
due
to
unique
properties,
high
surface
area
tunable
reactivity.
This
review
covers
four
main
categories:
nerve
agents,
blister
blood
choking
highlighting
recent
progress
nanosensor
development
each
category.
It
discusses
sensing
mechanisms
employed,
including
fluorescence,
colorimetry,
chemiresistivity,
electrochemistry,
Raman
spectroscopy.
these
advancements,
challenges
remain,
particularly
regarding
scalability,
stability,
selectivity
of
nanomaterials-based
sensors
complex
environments.
The
concludes
by
emphasizing
address
explore
novel
nanomaterials,
scalable
nanomanufacturing
techniques,
integration
artificial
intelligence
fully
unlock
potential
homeland
security
personal
safety.
Language: Английский