Here is a nice one:
http://www.physorg.com/news77.html
.....Pt atoms adsorbed onto Ge(001) surface form extremely well-ordered
nanowire arrays by self-organization after high-temperature annealing.
Using scanning tunneling spectroscopy and microscopy, authors show
that they are metallic and defect free. Nanowires are only 0.4 nm
thick with a spacing of 1.6 nm in between, and have aspect ratios up
to 1000...
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