Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
35(2)
Published: Nov. 7, 2024
Abstract
Herein,
a
new
concept
is
proposed
for
the
humidity‐induced
disappearance
of
photonic
stop
band
(PSB)
in
multilayer
films
1D
crystals
(PCs).
These
are
fabricated
via
alternating
spin‐coating
photo‐cross‐linkable
high
and
low‐refractive‐index
polymers
onto
black
polyethylene
terephthalate
(PET)
substrate,
followed
by
surface
immobilization
using
UV
light
irradiation.
The
sensitivity
to
humidity
adjusted
varying
degree
quaternization
(DQ)
P(4VP‐co‐BPA)
layers.
resulting
initially
display
vivid
colors;
however,
as
gradually
increases,
PSB
undergoes
red
shift
accompanied
decrease
reflectivity,
thus
leading
color.
reduction
reflectivity
can
be
attributed
infiltration
water
molecules
(
n
=
1.33)
into
quaternized
high‐refractive‐index
layers,
refractive
index
an
increase
layer
thickness.
This
leads
diminished
contrast
between
indices
high‐
ultimately
causing
simultaneous
reflection
Additionally,
two
patterned
with
responsiveness
application
anti‐counterfeiting
labels.
findings
advance
crystal
research
offer
innovative
solutions
security
authentication.
Small,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Abstract
One‐dimensional
photonic
crystals
(1D
PCs)
emerged
as
superb
sensing
platforms
due
to
their
high
sensitivity
environmental
changes.
However,
effectively
translating
the
microscopic
interactions
between
covalent
organic
frameworks
(COFs)
and
analytes
into
macroscopic
optical
responses
via
1D
PCs
for
intuitive
detection
presents
a
significant
challenge.
Here,
we
propose
stepwise‐induced
synthesis
strategy
that
first
time
achieves
size‐controlled
of
uniform
nanoscale
COFs
(60–80
nm),
leading
high‐quality
COF
layer.
This
advancement
enables
COF‐based
exhibit
diverse
color
variations
controllable
saturation.
Notably,
excellent
compatibility
layer
with
inorganic
oxides,
polymers,
metal‐organic
(MOFs)
results
in
these
exhibiting
bright
colors.
Crucially,
introducing
mesoporous
materials
achieve
deep
integration
adsorption
recognition
functions
volatile
compounds
(VOCs).
The
fabricated
COF/MOF
PC
allows
differentiation
12
VOCs
visually
detects
at
different
concentrations
(0–80
g
m
−
3
)
through
changes,
response
under
1
s.
In
particular,
can
be
transferred
flexible
substrates
while
retaining
VOC
visual
sensing.
These
attributes
highlight
potential
real‐time
monitoring
industrial
environments.
Materials Horizons,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 1, 2025
Traditional
thermochromic
materials
prioritize
high
sensitivity
and
rapid
discoloration.
Reversible
thermochromism
with
delayed
discoloration
is
highly
desirable
for
applications
like
thermal
history
indicators
energy-saving
windows,
yet
it
has
rarely
been
achieved.
Here,
we
construct
such
composites
simply
by
assembling
hydrophobic
silica
nanoparticles
in
a
polydimethylsiloxane
(PDMS)
matrix.
The
films
transition
from
colorless
translucent
to
blue
within
minutes
when
heated
above
60
°C
retain
their
color
over
eight
hours
at
20
°C.
Remarkably,
the
time
can
be
further
extended
lowering
environmental
relative
humidity.
Integrating
measurements
of
water
absorption,
refractive
indices,
optical
model
calculation,
demonstrate
that
coloration
rises
combined
effects
Rayleigh
scattering
multiple
prolonged
surprisingly
caused
gradual
absorption
moisture.
This
unique
material
opens
new
avenues
advancing
technology
applications.
ACS Applied Materials & Interfaces,
Journal Year:
2024,
Volume and Issue:
16(44), P. 61360 - 61370
Published: Oct. 24, 2024
The
widespread
use
of
counterfeit
goods
caused
significant
damage
to
economy,
personal
data
security,
and
public
health.
There
is
an
urgent
need
develop
innovative
anticounterfeiting
materials
enhance
their
performance.
Anticounterfeiting
labels
based
on
responsive
photonic
crystals
have
been
widely
researched
for
the
inherent
difficulty
in
replicating
delicate
structures
structure
colors.
By
integrating
various
distinct
nanoparticles
(NPs),
it
expected
produce
crystal
patterns
that
offer
more
intricate
color
effects
improved
capabilities.
In
this
work,
we
reported
a
label
with
dynamic
variations
solvent
vapors
pattern
conversions
upon
vapor
liquefication
by
utilizing
three
different
including
d-SiO2,
h-SiO2,
m-SiO2
NPs
as
building
blocks.
This
exhibits
wealth
changes
associated
absorption
time,
rate,
medium,
microstructure
nanoparticles,
offering
diverse
visual
showcasing
interesting
performances.
change
or
conversion
effect
(PC)
realized
through
refractive
index
induced
filling,
which
involves
no
volume
shows
exceptional
durability
repeated
applications.
promising
broad
applications
areas.
