WHY X-RAY IS LIMITED FOR NANOCRYSTALS STRUCTURE ANALYSIS?
X-ray crystallography is well adapted to structure analysis of perfect single crystals larger than a few micrometers. X-ray crystal interactions are kinematical and thus the structure factors can be directly derived from the diffracted intensity data. For nanocrystal structural studies use of powder X-ray diffraction present severe limitations as the grain size is very small and there is a severe peak broadening ( see photo below ). Therefore it becomes very difficult to solve ab-initio unknown nanostructures from X-ray diffraction ( see figure below ).
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