Justina Grabowska, Karuna Kar Nanda, R.T. Rajendra Kumar, J.P. Mosnier, M.O. Henry, Simon B. Newcomb, Patrick McNally, Lisa O’Reilly, Xu Lu, Enda McGlynn
Self-organized ZnAl 2 O 4 nanostructures with the appearance (in SEM) of high aspect ratio horizontal nanowires are grown on uncatalysed c-sapphire by vapour phase transport. The nanostructures grow as three equivalent crystallographic variants on c-sapphire. Raman and cathodoluminescence spectroscopy confirm that the nanostructures are not ZnO and TEM shows that they are the cubic spinel, zinc aluminate, ZnAl 2 O 4 , formed by the reaction of Zn and O with the sapphire substrate.
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