Nanostructured single-crystalline twin disks of zinc oxide

Nanostructural twin disks of zinc oxide with high yield were fabricated by vapor-phase transport using a mixture of zinc oxide, indium oxide, and graphite powders as source material. The twin disk consisted of two identical hexagonal disks with a size of about 1.5 mu m in diagonal and 100 nm in thickness. The scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction analysis demonstrated that the twin disk was a single crystal, enclosed by{0001}, {10 (1) over bar0}, and {10 (1) over bar1} surfaces. The growth process is discussed.