This diagram shows structure of
Mo-Te oxide nanowire. (a) Polyhedral representation and (b) ball-and
stick representation of a hexagonal unit of [TeIVMoVI6O21]2-, (c) a
single molecular wire of Mo-Te oxide. The bridge oxygen atoms that
connect the hexagonal units are highlighted in yellow. (d) Assembly of
single molecular wires into crystalline Mo-Te oxide. Mo: blue, Te (Se):
brown, O: red.
Credit: Zhang, et al., Nature Communications 6, 7731, Fig. 3.
Molecular wires composed of only inorganic materials have attracted
significant attention due to their stable structures, tunable chemical
compositions, and tunable properties. However, there have only been a
few reports regarding the development of all-inorganic molecular
nanowires.
Dr. Zhenxin Zhang and Prof. Wataru Ueda at the Catalysis Research
Center at Hokkaido University (Prof. Ueda is currently working for
Kanagawa University) and their collaborators at Hokkaido University,
Hiroshima University, and Japan Synchrotron Radiation Research
Institute/SPring-8 successfully created ultrathin all-inorganic
molecular nanowires, composed of a repeating hexagonal molecular unit
made of Mo and Te; the diameters of these wires were only 1.2 nm. These
nanowires were obtained by the disassembly of the corresponding crystals
through cation exchange and subsequent ultrasound treatment.
Furthermore, the researchers have shown that the ultrathin molecular
wire-based material exhibits high activity as an acid catalyst, and the
band gap of the molecular wire-based crystal is easily tuned via heat
treatment. It is expected that the metal oxide molecular wire-based
materials will open up new fields of research in heterogeneous
catalysts, thermochromic materials, and semiconductors, as well as other
related fields.
"This is a very rare isolated molecular nanowire based on transition
metal-oxygen octahedra, and is an attractive catalyst due to the large
surface area," said Professor Masahiro Sadakane, a coauthor of this
study, from Hiroshima University.
Story Source:
The above post is reprinted from
materials provided by
Hiroshima University.
Note: Materials may be edited for content and length.
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