Scientists Create a More Sustainable LED From Fish Scales

Graphic of carbon nano-onions
A
procedure
developed
by
scientists
in
Japan
can
convert
fish
scales
into
a
carbon-based
nanomaterial.

Takashi
Shirai
from
NITech,
Japan

Scientists
have
discovered
that
by
microwaving
fish
waste,
they
can
quickly
and
efficiently
create
carbon
nano-onions
(CNOs)—a
unique
nanoform
of
carbon
that
has
applications
in
energy
storage
and
medicine.
This
method
could
be
used
to
make
cheaper
and
more
sustainable
LEDs
in
the
future.
The
researchers
from
Nagoya
Institute
of
Technology
in
Japan
published
their
findings
in


Green
Chemistry

CNOs
are
nanostructures
with
spherical
carbon
shells
in
a
concentric
layered
structure
similar
to
an
onion.
They
have
“drawn
extensive
attention
worldwide
in
terms
of
energy
storage
and
conversion”
because
of
their
“exceptionally
high
electrical
and
thermal
conductivity,
as
well
as
large
external
surface
area,”
per
the
paper.
They’ve
been
used
in
electronics
and
for
biomedical
applications,
such
as
bio-imaging
and
sensing
and
drug
delivery,
write
the
authors
in
the
study. 

Though
CNOs
were
first
reported
in
the
1980s,
conventional
methods
of
manufacturing
them
have
required
high
temperatures,
a
vacuum
and
a
lot
of
time
and
energy.
Other
techniques
are
expensive
and
call
for
complex
catalysts
or
dangerous
acidic
or
basic
conditions.
This
“greatly
limits
the
potential
of
CNOs,”
per
a

statement

from
Nagoya
Institute
of
Technology.

The
newly
discovered method requires
only
one
step—microwave
pyrolysis
of
fish
scales
extracted
from
fish
waste—and
can
be
done
within
ten
seconds,
per
the
authors. 

How
exactly
the
fish
scales
are
converted
into
CNOs
is
unclear,
though
the
team
thinks
it
has
to
do
with
how
collagen
in
the
fish
scales
can
absorb
enough
microwave
radiation
to
quickly
increase
in
temperature.
This
leads
to
pyrolysis,
or
thermal
decomposition,
which
causes
the
collagen
to
break
down
into
gasses.
These
gasses
then
support
the
creation
of
CNOs. 

This
method
is
a
“straightforward
way
to
convert
fish
waste
into
infinitely
more
useful
materials,”
and
the
resulting
CNOs
have
a
high
crystallinity,
which
gives
them
“exceptional
optical
properties,”
per
the
statement.
They
also
have
high functionalisation,
which
means they’re “bonded
to
other
small
molecules
on
their
surface,”
writes Ellen
Phiddian
for


Cosmos
.
This
combination
of
attributes
means
the
CNOs
can
glow
bright
blue,
per

Cosmos

“The
CNOs
exhibit
ultra-bright
visible-light
emission
with
an
efficiency
(or
quantum
yield)
of
40
percent,”
says
Takashi
Shirai,
a
coauthor
and
professor
in
the
Nagoya
Institute
of
Technology’s
Department
of
Life
Science
and
Applied
Chemistry,
in
a
statement. “This
value,
which
has
never
been
achieved
before,
is
about
10
times
higher
than
that
of
previously
reported
CNOs
synthesized
via
conventional
methods.” 

Because
of
these
excellent
optical
properties,
the
CNOs
could
be
used
to
create
“large-area
emissive
flexible
films
and
LED
devices,”
Shirai
says
in
the
statement.
“These
findings
will
open
up
new
avenues
for
the
development
of
next-generation
displays
and
solid-state
lighting.”

Artikel ini diambil dari https://www.smithsonianmag.com/smart-news/scientists-create-more-sustainable-led-from-fish-scales-180980551/

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