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How to grow wires and tiny plates (MIT)
Researchers at MIT have found a way to grow submicroscopic wires in water with
great precision, using a method that makes it possible to produce entire
electronic devices through a liquid-based process.
The team demonstrated the technique, called hydrothermal synthesis, by
producing a functional light-emitting diode (LED) array made of zinc oxide
nanowires in a microfluidic channel. They were able to do so on a lab bench
under relatively benign conditions: essentially using a syringe to push
solution through a capillary tube one-tenth of a millimeter wide, without
expensive semiconductor manufacturing processes and facilities.
Unlike larger structures, with nanomaterials — those with dimensions measured
in nanometers, or billionths of a meter — differences in shape can lead to
dramatic differences in behavior. “For nanostructures, there’s a coupling
between the geometry and the electrical and optical properties,” explains
Brian Chow PhD ’08, co-author of a paper describing the results that was
published July 10 in the journal _Nature Materials_. “Being able to rationally
tune the geometry is very powerful because you can, in turn, tune the
functional properties.” The system Chow and his colleagues developed can
precisely control the aspect ratio (the ratio of length to width) of …
