AgI Nanoplates with Mesoscopic Superionic Conductivity at Room Temperature


  • We thank G. Götz, U. Klock, A. Fuchs, U. Traub and M. Konuma for their technical support.


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AgI nanoplates with unusual 7H and 9R polytype phases (see Figure) have been prepared in large quantities by a solution-based method using polyelectrolytes. The nanoplates exhibit extremely high conductivity, which is enhanced by four orders of magnitude compared to the macroscopic AgI phase (β-AgI), and a surprising conductivity isotropy, both of which can be explained by mesoscopic ionic-conductivity effects in polytype heterostructures.