ACS Sensors,
Journal Year:
2024,
Volume and Issue:
9(5), P. 2421 - 2428
Published: April 22, 2024
A
core-shell
nanostructure
of
gold
nanoparticles@covalent
organic
framework
(COF)
loaded
with
palladium
nanoparticles
(AuNPs@COF-PdNPs)
was
designed
for
the
rapid
monitoring
catalytic
reactions
surface-enhanced
Raman
spectroscopy
(SERS).
The
prepared
by
coating
COF
layer
on
AuNPs
and
then
in
situ
synthesizing
PdNPs
within
shell.
With
respective
SERS
activity
performance
AuNP
core
COF-PdNPs
shell,
can
be
directly
used
study
reaction
processes.
It
shown
that
confinement
effect
resulted
high
dispersity
outstanding
AuNPs@COF-PdNPs,
thus
improving
rate
constant
AuNPs@COF-PdNPs-catalyzed
hydrogenation
reduction
10
times
higher
than
obtained
Au/Pd
NPs.
In
addition,
serve
as
a
protective
shell
to
make
AuNPs@COF-PdNPs
possess
excellent
reusability.
Moreover,
loading
found
favor
avoiding
intermediate
products
achieve
total
conversion
rate.
also
showed
great
activities
toward
Suzuki-Miyaura
coupling
reaction.
Taken
together,
proposed
has
potential
exploring
processes
interfacial
reactions.
Advanced Functional Materials,
Journal Year:
2024,
Volume and Issue:
34(29)
Published: Feb. 29, 2024
Abstract
Semiconductor
materials
represent
an
ideal
choice
for
designing
surface‐enhanced
Raman
scattering
(SERS)‐based
sensors
due
to
their
superior
thermal
and
chemical
stability
compared
conventional
metal
materials.
However,
current
SERS‐active
semiconductor
substrates
have
limitations
such
as
low
detection
sensitivity
often
complicated
preparation
steps,
which
restrict
real‐life
applications.
In
this
work,
the
first
time
feasibility
of
large‐area
fabricating
based
on
screen‐printing
micron‐sized
TiO
2
ink
synthesized
through
a
simple
flame
thermal‐assisted
method
is
demonstrated.
The
resultant
microspherical
arrays
(MSAs)
exhibit
extraordinary
SERS
with
enhancement
factor
3.28
×
10
7
,
represents
one
highest
are
easiest
strategy
among
reported
substrates.
Both
experiments
simulations
rationalize
observed
propose
that
multiple
synergistic
resonances,
including
Mie
resonance,
charge‐transfer
molecular
resonance
significantly
boost
performance
Dye‐modified
MSAs
further
exploited
sensing
platform
development
ratiometric
sensor,
enabling
highly
sensitive,
selective,
cost,
stable
Hg
2+
ions.
This
study
opens
up
new
possibilities
preparing
large‐scale
array,
ultimately
advancing
fields
semiconductor‐based
technology.
Advanced Materials,
Journal Year:
2024,
Volume and Issue:
36(13)
Published: Jan. 9, 2024
Metastructures
are
widely
used
in
photonic
devices,
energy
conversion,
and
biomedical
applications.
However,
to
fabricate
multiple
patterns
continuously
single
etching
protocol
with
highly
tunable
properties
is
challenging.
Here,
a
simple
robust
dynamic
nanosphere
lithography
proposed
by
inserting
spacer
between
the
assembly
wafer.
The
diameter
decrease
uneven
penetration
of
during
lead
masking
process.
Coupled
anisotropic
physical
ion
sputtering
ricocheting
isotropic
chemical
radical
achieve
structures
various
3D
forming
through
Specifically,
diameters
define
periodicity,
etched
forms
upper
parts,
wafer
lower
parts.
Each
part
structure
changing
diameter,
thickness,
etch
conditions.
Using
this
protocol,
numerous
varying
sizes
including
nanomushrooms,
nanocones,
nanopencils,
nanoneedles
diverse
shapes
realized
as
proof
concepts.
broadband
antireflection
ability
nanostructures
their
use
surface-enhanced
Raman
spectroscopy
also
demonstrated
for
practical
application.
This
method
substantially
simplifies
fabrication
procedure
metastructures,
paving
way
its
application
disciplines
especially
devices.
ACS Sensors,
Journal Year:
2024,
Volume and Issue:
9(5), P. 2421 - 2428
Published: April 22, 2024
A
core-shell
nanostructure
of
gold
nanoparticles@covalent
organic
framework
(COF)
loaded
with
palladium
nanoparticles
(AuNPs@COF-PdNPs)
was
designed
for
the
rapid
monitoring
catalytic
reactions
surface-enhanced
Raman
spectroscopy
(SERS).
The
prepared
by
coating
COF
layer
on
AuNPs
and
then
in
situ
synthesizing
PdNPs
within
shell.
With
respective
SERS
activity
performance
AuNP
core
COF-PdNPs
shell,
can
be
directly
used
study
reaction
processes.
It
shown
that
confinement
effect
resulted
high
dispersity
outstanding
AuNPs@COF-PdNPs,
thus
improving
rate
constant
AuNPs@COF-PdNPs-catalyzed
hydrogenation
reduction
10
times
higher
than
obtained
Au/Pd
NPs.
In
addition,
serve
as
a
protective
shell
to
make
AuNPs@COF-PdNPs
possess
excellent
reusability.
Moreover,
loading
found
favor
avoiding
intermediate
products
achieve
total
conversion
rate.
also
showed
great
activities
toward
Suzuki-Miyaura
coupling
reaction.
Taken
together,
proposed
has
potential
exploring
processes
interfacial
reactions.
