Journal of the American Chemical Society,
Journal Year:
2024,
Volume and Issue:
146(46), P. 31486 - 31496
Published: Nov. 6, 2024
Chemical
sensing
methodology
based
on
electrochemical
impedance
spectroscopy
(EIS)
targeting
analytes
in
aqueous
samples
functionalized
single-walled
carbon
nanotube
(SWCNT)
is
reported.
The
SWCNT
contact
with
electrolyte
shows
unique
spectra
that
cannot
be
analyzed
classical
equivalent
circuit
models.
Inspired
by
the
charge
transport
property
of
mixed
ionic-electronic
conductors,
we
propose
an
transmission
line
model
(TLM),
which
CNT-electrolyte
system
can
to
track
down
all
parameters.
By
combining
multiple
pieces
information,
are
technically
immeasurable
conventional
chemiresistive
or
chemicapacitive
techniques,
several
analyte
species
responding
sensor
differentiated
from
each
other.
We
demonstrate
"chemi-impeditive"
concept
chemically
modified
SWCNTs
for
detecting
perfluoroalkyl
substances
(PFAS)
solutions.
EIS
coupled
a
fluorination
chemistry
surface
provides
changes
components
PFAS,
i.e.,
CNT
and
solution
resistances,
as
well
interfacial
CNT-solution
capacitance,
through
perfluorooctanesulfonic
acid,
perfluorooctanoic
hexafluoropropylene
oxide
dimer
perfluorobutanesulfonic
acid
detected
discriminative
manner.
new
impedimetric
method
opens
up
vistas
chemical
analysis
additional
dimension
information
beyond
single
resistance
capacitance
typically
measured
many
types
sensors.
Research Square (Research Square),
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 12, 2025
Abstract
Per-
and
poly-fluoroalkyl
substances
(PFAS)
have
received
significant
attention
due
to
their
persistence
in
the
environment.
Because
of
accumulative
nature,
even
trace
amounts
can
adversely
impact
human
health
ecosystems.
Here,
we
present
Molecule-Probed
Raman
Spectroscopy
(MPRS),
an
ultra-sensitive,
low-cost,
fast
method
that
achieve
femtogram-per-liter
detection
PFAS,
surpassing
any
existing
methods
by
at
least
four
orders
magnitude.
In
contrast
monitoring
spectrum
MPRS
monitors
changes
molecular
probes,
methyl
group
(-CH3)
on
polydimethylsiloxane,
upon
PFAS
capture.
succeeds
detecting
multiple
individual
water
complex
matrices
such
as
surface
blood.
We
also
demonstrated
feasibility
on-site
using
a
portable
spectrometer.
Beyond
its
transformative
capability,
establishes
new
analyte
paradigm,
paving
way
for
innovative
material
systems
instruments.
RSC Applied Polymers,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
The
fluorescent
PPMI
polymer
exhibits
aggregation-caused
quenching
(ACQ)
and
indicator
displacement
assay
(IDA)
“turn-on”
responses
towards
perfluorooctanoic
acid
in
aqueous
media,
with
limits
of
detection
0.21
μM
16.1
nM,
respectively.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 28, 2025
Abstract
Measuring
anisotropic
exciton
transport
in
organic
crystals
goes
beyond
just
assessing
one‐dimensional
(1D)
transport.
It
offers
a
deeper
understanding
of
how
molecular
packing
and
interactions
affect
different
dimensions.
However,
achieving
nanoscale
precision
measuring
lengths
linking
them
to
specific
crystalline
directions
remains
formidable
challenge.
Here
the
development
photoetching
method
is
reported
visualize
distances
as
gaps
within
two‐dimensional
(2D)
crystals,
which
turn
allows
for
use
scanning
electron
microscope
(SEM)
precisely
measure
sizes.
The
combined
with
hetero‐seeded
self‐assembly
enables
conventional
fluorescence
spectrometry
precise
determination
2D
structures
at
nanoscale.
Relying
on
this
novel
method,
unexpectedly
found
that
increasing
intermolecular
one
crystal
direction
not
only
improves
dimension
but
also
enhances
other
dimension.
These
findings
provide
valuable
insights
engineering
materials
require
efficient
across
extended
distances.
Analytical Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 29, 2025
Molecular
recognition
has
traditionally
been
focused
on
ground-state
interactions.
However,
leveraging
photoenergy
to
access
excited-state
molecular
recognition,
which
may
enable
enhanced
sensitivity
or
selectivity
that
is
unattainable
in
the
ground
state,
remains
underexplored.
In
this
study,
we
demonstrate
a
novel
photoinduced
mechanism
using
self-assembled
crystalline
microribbons
composed
of
donor-acceptor
(D-A)
molecule
with
twisted
backbone
for
ultratrace
phenol
vapor
detection.
We
confirm
proton
transfer
occurs
from
C═N
group
pyridine
moiety
D-A
system,
generating
protonated
and
phenoxide
ion
triggers
fluorescence
quenching.
This
proton-transfer-mediated
endows
exceptional
toward
vapor,
achieving
limit
detection
(LOD)
0.6
parts
per
trillion
(ppt).
Our
findings
reveal
harnessing
light
energy
drive
opens
new
avenues
advancing
sensing
technologies.
Analytical Chemistry,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 2, 2025
The
global
contamination
of
water
bodies
by
persistent
organic
pollutants
(perfluoroalkyl
substances
(PFAS))
has
generated
significant
societal
concern,
emphasizing
the
urgent
need
for
smart
strategies
their
rapid,
ultratrace,
and
on-site
detection.
Conjugated
polymers
(CPs)
are
exceptional
fluorescence
sensing
materials
with
signal-amplification
properties,
yet
performance
is
often
hindered
a
conventional
aggregation-caused
quenching
(ACQ)
effect.
Herein,
we
present
two
acceptor-engineered
aggregation-induced
emission
(AIE)-active
CPs
(FTD-MI
FTD-C8-MI)
integrated
efficient
Förster
resonance
energy
transfer
(FRET)
mechanisms
ultralow
detection
PFAS.
FTD-MI
exhibits
turn-off
(cyan
to
dark)
response,
while
FTD-C8-MI
shows
ratiometric
red)
response
PFAS
due
synergistic
effect
AIE
interchain
FRET,
facilitated
electrostatic
hydrophobic
interactions
upon
binding.
Both
demonstrate
excellent
sensitivity
at
subnanomolar
level
toward
most
abundant
PFAS,
perfluorooctanoic
acid
(PFOA),
perfluorooctanesulfonic
(PFOS).
mechanism
been
thoroughly
investigated
both
experimental
simulation
studies.
Additionally,
an
optical
sensor
array
coupled
machine
learning
algorithms
established
discriminative
six
types
Finally,
portable
smartphone
platform
custom-designed
"app"
was
developed
real-time,
on-site,
semiquantitative
analysis
in
actual
samples.
Thus,
providing
sensitive,
portable,
cost-effective,
user-friendly
solution,
this
work
offers
powerful
tool
monitoring
pollution,
ensuring
safety,
reducing
risks
public
health.
Journal of Chemical Theory and Computation,
Journal Year:
2025,
Volume and Issue:
unknown
Published: June 3, 2025
Easily
tunable
and
processable,
porous
organic
polymers
(POPs)
have
found
increasing
utility
in
various
applications.
Molecular
modeling
simulations
are
invaluable
tools
polymer
science
but
remain
under-reported
the
POP
literature.
Accurate
simulation
of
these
materials
could
boost
discovery
high-performance
POPs
allow
for
a
more
thorough
contribution
to
big
data.
These
contain
free
volume-promoting
structural
units,
such
as
iptycenes,
exhibit
high
glass-transition
temperatures,
excellent
thermal
stability,
functionality.
However,
popular
transferable
force
fields
utilized
all-atomistic
molecular
dynamics
(MD)
not
fully
parametrized
intrinsically
thermoplastic
materials.
We
present
streamlined
workflow
MD
nonporous
amorphous
In
conjunction
with
programs
ORCA,
Q-Force,
Assemble!,
GROMACS,
highly
accessible
methodology
is
established
field
(FF)
parametrization,
creation
initial
configurations,
polymers.
This
protocol
can
reproduce
experimental
bulk
densities
fractional
volume
values
polymeric
accuracy
has
been
made
available
Python
package,
called
PolyPal.
As
an
example,
we
our
results
using
PolyPal
on
series
that
were
previously
synthesized
experimentally
characterized.
FF
was
also
validated
through
solid-state
NMR
studies.
will
only
open
new
avenues
rational
design
improved
insight
provide
pathway
simulating
unexplored
Analytical Chemistry,
Journal Year:
2024,
Volume and Issue:
96(45), P. 18178 - 18186
Published: Oct. 29, 2024
Per-
and
polyfluoroalkyl
substances
(PFASs)
are
a
class
of
persistent
micropollutants.
Due
to
their
chemical
stability
bioaccumulation,
concentrations
PFASs
in
environmental
media,
even
at
ultratrace
levels,
pose
significant
health
risks.
However,
currently
reported
detection
methods
lack
an
effective
signal
amplification
strategy,
the
sensitivity
is
limited,
which
can
not
meet
requirements
detection.
Herein,
groundbreaking
aptamer-recognition-driven
nucleic
acid
strategy
was
developed
significantly
amplify
perfluorooctanoic
(PFOA).
Furthermore,
step
pulse
(SP)
used
instead
cyclic
voltammetry
(CV)
as
electrochemical
excitation
method
modulate
low
electrochemiluminescence
(ECL)
triggering
potential
poly
[9,9-bis
(3′-(N,
N-dimethylamino)
propyl)
−2,7-fluorene]-alt-2,7-(9,9-dioctylfluorene)]
(PFN)
nanoparticles
(NPs)
so
that
strong
+0.80
V
emitted
without
any
exogenous
coreactants.
PFN
NPs
coupled
rolling
circle
amplification-assisted
PAM-free
CRISPR/Cas12a
system
construct
ultrasensitive
ECL
aptasensor
for
PFOA
limit
1.97
×
10–15
M.
This
integrated
advantages
no
coreactants,
trigger
potential,
provided
monitoring
trace
real
water
sample.