Evidence for surface reconstruction on InAs nanocrystals

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Abstract
By means of photoelectron spectroscopy with synchrotron radiation we have studied the surfaces of colloidally prepared InAs nanocrystals in the 30–60 Å size range. We find evidence that specific surface states exist for both In and As atoms and that the passivating trioctylphosphine ligands form chemical bonds with a fraction of the surface In and As atoms. There is evidence for a significant amount of bond-length variation at the nanocrystal surface.