The (0001) surface of alpha-Al2O3 single crystals has been imaged by atomic force microscopy in water. The observed hexagonal lattice arrangement has a period of 4.7 angstrom, in good agreement with the known bulk unit cell. The sample cleaning procedure was found to be crucial in obtaining clean terraces and achieving lattice resolution.
Journal of Physical Chemistry B Vol. 109, no. 25, p. 12474-12479