Can new stunning
varieties of nanostructures, with remarkable optical, electronic, catalytic and
mechanical properties, comprising metal cores within shells of inorganic
compounds, be generated in the laboratory, in procedures that are
simultaneously safe, rapid, high-yield, and amenable to scale-up?
The teams of Prof.
Reshef Tenne at the Weizmann Institute of Science, and Prof. Jeffrey Gordon and Prof. Daniel Feuermann at BGU's Jacob Blaustein Institutes for Desert Research (BIDR) combined expertise
in materials science and solar concentrator optics to do just that. They have
produced yet another "first" in the realization of singular
nanomaterials: both closed-cage (fullerene-like) and nanotube particles with a
metal (lead, Pb) core, and outer shells of gallium sulfide (GaS).
Above: Prof. Daniel Feuermann (left) and Prof. Jeffrey Gordon (right).
The article detailing
their success was published in the journal NANO
with the journal having chosen to showcase this article on its cover-page.
The use of immensely
concentrated sunlight at the service of fundamentally new nanomaterials
represents a new paradigm for solar energy, geared toward generating valued new
materials at the service of human technology, rather than producing heat,
electricity or fuels.
In terms of future
applications: The strongly anisotropic optical, electrical, and mechanical
properties of GaS make these nanostructures promising candidates for assorted
optoelectronic devices and sensors. In addition, GaS nanostructures can
intercalate foreign atoms, yielding electrochemical properties that render them
suitable for rechargeable batteries.
The principal novelty
here is the experimental realization of core-shell Pb@GaS nanostructures that
had been neither anticipated nor synthesized previously. Their realization was
elusive because the thickness of the GaS layers hampers the formation of such
highly-curved structures.
But the unique extensive
ultra-high-temperature (approaching 3000°C) reaction and annealing conditions
created in the solar furnaces developed by Professors Gordon and Feuermann for
these experiments are conducive to these unusual formations.
Furthermore, part of the
interest in these Pb-filled nanostructures stems from recent studies showing
the effect of the shape and size of Pb nanoparticles on their superconducting
properties, and intimating that Pb@GaS nanoparticles may have novel
superconducting properties, which the authors hope to explore in future
investigations.
Gordon and Feuermann are
members of the Alexandre Yersin Department of Solar Energy and EnvironmentalPhysics (YDSEEP) of The Swiss Institute for Dryland Environmental & Energy Research, one of the Jacob Blaustein Institutes for Desert Research at BGU.
This research was supported by Israel Science
Foundation First Program Grant No. 469/11 and the support of the Israel
National Nano-Initiative, the H. Perlman Foundation, the Irving and Azelle
Waltcher Foundation in honor of Prof. M. Levy, and the Irving and Cherna
Moskowitz Center for Nano and Bio-Nano Imaging.