DYNAMICS OF ABSORPTION PEAKS IN PLASMONIC NANOSTRUCTURES
Colloids and Surfaces A Physicochemical and Engineering Aspects,
Journal Year:
2025,
Volume and Issue:
709, P. 136115 - 136115
Published: Jan. 5, 2025
Language: Английский
Bacterial synthesis of anisotropic gold nanoparticles
Applied Microbiology and Biotechnology,
Journal Year:
2025,
Volume and Issue:
109(1)
Published: March 10, 2025
Abstract
Pseudomonas
aeruginosa
was
used
to
synthesize
anisotropic
gold
nanoparticles
from
the
unusually
reducible
aryldiazonium
(III)
salt
of
chemical
formula
[HOOC-4-C
6
H
4
N≡N]AuCl
(abbreviated
as
DS-AuCl
).
We
investigated
effect
bacterial
cell
density,
temperature,
and
pH
on
AuNP
synthesis.
The
density
6.0
×
10
8
CFU/mL
successfully
reduced
0.5
mM
AuNPs
after
incubation
at
37
°C
(24
h),
42
25
(48
h).
Transmission
electron
microscopy
(TEM)
images
revealed
formation
spherical,
triangle,
star,
hexagon,
truncated
triangular
morphologies
for
synthesized
using
P.
bacteria.
average
size
h)
39.0
±
9.1
nm,
26.0
8.1
36.7
7.7
respectively.
3.7,
7.0,
12.7
14.7
3.8
7.3
2.5
respectively,
with
decreasing
a
12.7.
reduction
confirmed
X-ray
photoelectron
spectroscopy
(XPS).
significant
peaks
C1s,
Au4f
doublet,
N1s,
O1s
are
centered
285,
84–88,
400,
532
eV.
ability
inactivated
bacteria
(autoclave-dead
mechanically
lysed
bacteria),
peptidoglycan,
lipopolysaccharides
reduce
also
investigated.
Anisotropic
were
peptidoglycan
but
not
lipopolysaccharides.
demonstrated
biocompatibility
human
RBCs
safe,
no
antibacterial
activities
against
Escherichia
coli
Staphylococcus
aureus
.
This
is
first
report
demonstrating
synthesis
gold(III)
salts
These
promising
candidates
exploring
potential
applications
in
nanomedicine
drug
delivery.
Key
points
•
Dead
residues
AuNPs.
hemocompatible.
Graphical
Language: Английский
Growth of NIR-II-Responsive Gold Nanobipyramids with Improved Yield and a Study of Their Application in Cancer Therapy
Langmuir,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 23, 2025
Gold
nanobipyramids
(Au
NBPs),
as
a
novel
and
emerging
plasmonic
nanomaterial,
have
shown
larger
local
electric
field
enhancements,
optical
cross-sections,
higher
refractive
index
sensitivity
compared
to
other
nanoparticles.
Besides,
their
localized
surface
plasmon
resonance
(LSPR)
absorption
can
be
tailored
cover
the
entire
NIR-II
light
region,
which
is
crucial
for
clinical
cancer
treatment.
However,
strategies
synthesize
Au
NBPs
with
an
response
still
several
disadvantages,
such
tedious
procedures
use
of
hazardous
chemical
substances.
In
this
work,
we
used
seed-mediated
growth
method
explored
new
high-yield
response,
especially
in
region
above
1030
nm,
by
regulating
conditions
during
seed
growth.
The
yield
at
1060
nm
has
been
improved
5-fold
6-fold
previous
methods
when
230
μL
sodium
citrate
or
controlled
temperature
45
°C
were
solution
containing
125
NaBH4.
influence
mechanism
these
factors
on
detail.
Furthermore,
photodynamic
photothermal
behaviors
LSPR
investigated,
results
indicate
that
great
potential
therapy.
proven
induce
immunogenic
cell
death
(ICD),
indicating
immunotherapy.
This
work
may
provide
idea
synthesis
biomedical
applications
response.
Language: Английский
Isomerization of inorganic nanomaterials
MRS Communications,
Journal Year:
2025,
Volume and Issue:
unknown
Published: May 15, 2025
Language: Английский
Expanding Chemical Space in the Synthesis of Gold Bipyramids
Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Nov. 9, 2024
Gold
bipyramids
(AuBPs),
despite
having
superior
properties
compared
to
their
spectroscopically
similar
counterparts,
gold
nanorods,
have
found
comparatively
limited
applications.
This
discrepancy
is
primarily
due
the
lack
of
protocols
tailor
dimensions.
Typically,
concentration
Au
seeds
virtually
sole
factor
that
determines
aspect
ratio
and
thus,
optical
AuBPs.
As
a
result,
varying
volumes
AuBPs
while
incurring
minimal
changes
spectra
remains
synthetically
non-trivial
task.
Here,
chemical
space
in
seeded
growth
AuBPs,
expanded
by
exploiting
interplay
between
bromide,
silver
ions,
seed
for
tuning
final
dimensions
Specifically,
6
fold
change
achieved
maintaining
fixed
plasmon
band
position.
Further
overgrowth
as-prepared
broadens
realizable
without
compromising
quality
initial
morphology.
Overall,
results
expand
toolbox
wet-chemistry
synthesis
anisotropic
nanoparticles,
which
relevant
health,
colorimetric
sensors,
energy
Language: Английский
Expanding Chemical Space in the Synthesis of Gold Bipyramids
Published: July 26, 2024
Gold
bipyramids
(AuBPs),
despite
having
superior
properties
compared
to
their
spectroscopically
similar
counterparts,
gold
nanorods,
have
found
comparatively
limited
applications.
This
discrepancy
is
primarily
due
the
lack
of
protocols
tailor
dimensions.
Typically,
concentration
Au
seeds
virtually
sole
factor
that
determines
aspect
ratio
and
thus,
optical
AuBPs.
As
a
result,
varying
volumes
AuBPs
while
incurring
minimal
changes
spectra
remains
synthetically
non-trivial
task.
Here,
we
expand
chemical
space
in
seeded
growth
AuBPs,
by
exploiting
interplay
between
bromide,
silver
ions,
seed
for
tuning
final
dimensions
Specifically,
achieved
6-fold
change
maintaining
fixed
plasmon
band
position.
Further
overgrowth
as-prepared
broadens
realizable
without
compromising
quality
initial
morphology.
Overall,
our
results
toolbox
wet-chemistry
synthesis
anisotropic
nanoparticles,
which
relevant
health,
colorimetric
sensors,
energy
Language: Английский