University of Leeds – August 6, 2019 –- Scientists
at the University of Leeds have created a new form of gold which is just two
atoms thick -- the thinnest unsupported gold ever created.
The researchers measured the thickness
of the gold to be 0.47 nanometres -- that is one million times thinner than a
human finger nail. The material is regarded as 2D because it comprises just two
layers of atoms sitting on top of one another. All atoms are surface atoms --
there are no 'bulk' atoms hidden beneath the surface.
The material could have wide-scale
applications in the medical device and electronics industries -- and also as a
catalyst to speed up chemical reactions in a range of industrial processes.
Laboratory tests show that the
ultra-thin gold is 10 times more efficient as a catalytic substrate than the
currently used gold nanoparticles, which are 3D materials with the majority of
atoms residing in the bulk rather than at the surface.
Scientists believe the new material
could also form the basis of artificial enzymes that could be applied in rapid,
point-of-care medical diagnostic tests and in water purification systems.
The announcement that the ultra-thin
metal had been successfully synthesised was made in the journal Advanced
Science.
The lead author of the paper, Dr Sunjie
Ye, from Leeds' Molecular and Nanoscale Physics Group and the Leeds Institute
of Medical Research, said: "This work amounts to a landmark achievement.
"Not only does it open up the
possibility that gold can be used more efficiently in existing technologies, it
is providing a route which would allow material scientists to develop other 2D
metals.
"This method could innovate
nanomaterial manufacturing."
The research team are looking to work
with industry on ways of scaling-up the process.
Synthesising the gold nanosheet takes
place in an aqueous solution and starts with chloroauric acid, an inorganic
substance that contains gold. It is reduced to its metallic form in the
presence of a 'confinement agent' -- a chemical that encourages the gold to
form as a sheet, just two atoms thick.
Because of the gold's nanoscale
dimensions, it appears green in water -- and given its shape, the researchers
describe it as gold nanoseaweed.
Images taken
from an electron microscope reveal the way the gold atoms have formed into a
highly organised lattice. Other images show gold nanoseaweed that has been
artificially coloured.
Professor
Stephen Evans, head of the Leeds' Molecular and Nanoscale Research Group who
supervised the research, said the considerable gains that could be achieved
from using these ultra-thin gold sheets are down to their high surface-area to
volume ratio.
He said:
"Gold is a highly effective catalyst. Because the nanosheets are so thin,
just about every gold atom plays a part in the catalysis. It means the process
is highly efficient."
Standard
benchmark tests revealed that gold nanoscale sheets were ten times more
efficient than the gold nanoparticles conventionally used in industry.
Professor
Evans said: "Our data suggests that industry could get the same effect
from using a smaller amount of gold, and this has economic advantages when you
are talking about a precious metal."
Similar
benchmark tests revealed that the gold sheets could act as highly effective
artificial enzymes.
The flakes
are also flexible, meaning they could form the basis of electronic components
for bendable screens, electronic inks and transparent conducting displays.
Professor
Evans thinks there will inevitably be comparisons made between the 2D gold and
the very first 2D material ever created -- graphene, which was fabricated at
the University of Manchester in 2004.
He said:
"The translation of any new material into working products can take a long
time and you can't force it to do everything you might like to. With graphene,
people have thought that it could be good for electronics or for transparent
coatings -- or as carbon nanotubes that could make an elevator to take us into
space because of its super strength.
"I
think with 2D gold we have got some very definite ideas about where it could be
used, particularly in catalytic reactions and enzymatic reactions. We know it
will be more effective than existing technologies -- so we have something that
we believe people will be interested in developing with us."
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