Analytical Chemistry,
Год журнала:
2024,
Номер
96(49), С. 19545 - 19552
Опубликована: Ноя. 21, 2024
Microplastics
and
nanoplastics
are
emerging
contaminants
that
pose
a
threat
to
the
environment
human.
Spectroscopic
technologies
advantageous
in
analyzing
nanoplastics,
but
it
is
challenging
selectively
detect
with
different
size
thresholds.
In
this
work,
hyphenated
method
of
electrosorption
surface-enhanced
Raman
spectroscopy
(ES-SERS)
was
developed
for
simple,
rapid,
size-resolved
analysis
trace
polystyrene
(PS)
from
20
300
nm.
A
rough
silver
used
as
both
working
electrode
substrate
SERS
response.
By
applying
positive
electric
potential
silver,
PS
accelerated
toward
surface
were
adsorbed
tightly
at
"hot
spot"
inside
nanostructure.
The
proposed
ES-SERS
achieved
detection
limit
100
ng/L
nm
PS,
50
30
nanoplastics.
It
worth
noting
smaller
typically
exhibit
larger
analytical
enhancement
factor
values
ES-SERS.
According
difference
electromigration
behavior
various
sizes,
under
certain
can
be
enriched
detected
by
controlling
time.
successfully
demonstrated
detecting
released
lids
disposable
beverage
cups.
This
work
opens
up
new
possibilities
Chemical Communications,
Год журнала:
2024,
Номер
60(67), С. 8840 - 8843
Опубликована: Янв. 1, 2024
Au@Ag
core-shell
composites
were
successfully
fabricated
on
urchin-like
covalent
organic
frameworks
(COFs),
providing
a
platform
with
numerous
hot
spots
for
the
detection
of
two
categories
emerging
contaminants:
sulfonamide
antibiotics
and
nanoplastics,
using
surface-enhanced
Raman
spectroscopy
(SERS).
Au
seeds
(∼10
nm)
generated
COFs,
leveraging
reducing
properties
vinyl
imino
groups
within
framework.
This
ensured
growth
dense
uniformly
distributed
Ag
nanoparticles.
The
COFs
exceptionally
large
surface
area
(2324
m
Acta Physica Sinica,
Год журнала:
2025,
Номер
74(5), С. 0 - 0
Опубликована: Янв. 1, 2025
Surface
enhanced
Raman
spectroscopy
(SERS)
can
provide
rich
molecular
structure
information
with
ultra-sensitive,
non-destructive,
and
rapid
detection
down
to
the
single-molecule
level.
It
has
been
widely
applied
in
physics,
chemistry,
biomedicine,
environmental
science,
material
science
other
fields.
Combining
advantages
of
metals
2D
nanomaterials,
various
2D/metal
composite
structures
have
proposed
for
SERS.
However,
contribution
nanomaterials
enhancement
is
often
limited.
In
this
work,
vertically
aligned
MoS<sub>2</sub>
nanosheet
silver
nanoparticles
(Ag
NPs)
was
SERS
detection.
Large-area
nanosheets,
which
were
grown
directly
on
molybdenum
(Mo)
foil
using
hydrothermal
method,
effectively
enhance
adsorption,
light
absorption,
dual
electromagnetic
chemical
enhancement.
Furthermore,
annealing
treatment
nanosheets
significantly
improves
efficiency
charge
transfer
between
Ag
NPs
MoS<sub>2</sub>,
thereby
increasing
The
results
demonstrate
that
annealed
MoS<sub>2</sub>/Ag
substrate
exhibits
outstanding
performance,
a
limit
R6G
molecules
as
low
10<sup>-12</sup>
M,
four
orders
magnitude
lower
than
unannealed
substrate.
factor
(EF)
calculated
be
approximately
1.08×10<sup>9</sup>,
approaching
sensitivity
required
Additionally,
performs
high
signal
reproducibility
at
concentrations,
enabling
ultra-sensitive
pesticide
residues
aquatic
products.
Combining
the
advantages
of
metal
and
two-dimensional
(2D)
nanomaterials,
various
2D/metal
composite
structures
are
proposed
as
surface-enhanced
Raman
spectroscopy
(SERS)
substrates.
However,
chemical
enhancement
in
structure
is
usually
less
responsible
for
total
enhancement.
In
this
work,
we
a
heterostructure
including
WTe2/graphene/Ag
nanoparticles
(WTe2/Gr/Ag)
an
effective
platform
SERS.
The
matching
energy
levels
facilitates
charge
transfer
(CT)
within
structure,
which
turn
significantly
improves
Compared
with
WTe2/Ag
or
Gr/Ag
substrate,
SERS
signals
can
be
amplified
up
to
18-fold,
detection
limit
could
further
reduce
3
orders
magnitude.
Furthermore,
CT
process
test
promoted
after
introducing
pyroelectric
field
based
on
ferro-electricity
WTe2.
factor
WTe2/Gr/Ag
substrate
finally
reached
1.34
×
1012.
This
work
proposes
new
idea
design
highly
sensitive
sensors.
