Heterogeneous Nanostructures and Composites
Some nanostructures are homogeneous— the examples of gold nano-dots in stained glass or titanium dioxide nanodots for battery applications come to mind. There are also many heterogeneous nanostructures and nanocomposites. Heterogeneous means, in this case, that the material is not the same physically throughout its bulk.
One simple but lovely example is offered by core/shell nanoparticles. Many groups worldwide have made these structures for several purposes. They usually resemble nanoscale gumballs, with an inner core of one material and a thin outer shell of a second material. Chad Mirkin's group has used silver-core, gold-coated nanodots in DNA detection, and Moungi Bawendi's group at MIT pioneered ...
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