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Advanced Materials

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.


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.

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