Ring-a-ring o'rods: Hybrid gold/polymer core–shell nanorods spontaneously organize into ringlike arrays when a drop of their solution is dried on a substrate. The process is highly reproducible and generates thousands of well-defined rings of nanorods in a matter of seconds (see TEM image). Studies revealed that water droplets, which condense on the surface of nonpolar solvents, template the formation of the rings.
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