Thanks, for the specimens in the two series below, are due to colleages working on nano-porous/quantum-dot architectures for biosensing with Shubhra Gangopadhyay, Sheila Grant, and Xudong Fan at Missouri University.
Planar section of a dip-coated specimen...
...showing pores (long tubes only a few atoms in diameter) with significant self-ordering
Cross-section of same...
...showing lovely 22.5A-layers from top to bottom
Literature analysis topview for comparison
Planar section: Early-stage self-ordering of pores...
...into tiny periodic arrays
Cross-section: More short-range ordering clues
Zooming in to some thin areas...
...makes analysis of ordering with power spectra possible
Although there's not much to see above, do you see lines here?
The power spectra below at least show measurable vertical periodicity
Digital darkfield image of CdSe nanocrystal specimen being developed for use in such pores
