Universal Synthesis of
Single-Phase Pyrite FeS<sub>2</sub> Nanoparticles, Nanowires, and
Nanosheets
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Abstract
Nanoscale pyrite FeS<sub>2</sub> is considered to be
one of few
potentially transformative materials for photovoltaics capable of
bridging the cost/performance gap of solar batteries. It also holds
promise for energy storage applications as the material for high-performance
cathodes. Despite prospects, the synthesis of FeS<sub>2</sub> nanostructures
and diversity of their geometries has been hardly studied. Moreover,
the state-of-the-art aqueous dispersions of nanoscale pyrite, which
have special significance for solar energetics, are particularly disappointing
due to low quality. There are no known methods to produce well-crystallized
nanoparticles and other geometries of nanoscale pyrite in water or
mixed aqueous solvents. Here, we describe a successful synthesis of
single-phase pyrite nanoparticles with a diameter of 2–5 nm
in polar solvent and aqueous dispersions. The particles display high
uniformity and crystallographic purity. Moreover, the synthetic approach
developed for nanoparticles was proven to be quite universal and can
be modified to produce both nanowires and nanosheets, which also display
high crystallinity. The diameter of the pyrite nanowires was 80–120
nm with the length exceeding 5 μm. The nanosheets displayed
lateral dimensions of 100–200 nm with the thickness of 2 nm.
Availability of single-phase FeS<sub>2</sub> nanoscale aqueous dispersions
is expected to stimulate further studies of these materials in green
energy conversion technologies and drug delivery applications