Gallium nitride (GaN) nano-ribbon rings were formed through a simple sublim
ation method. They were characterized by x-ray powder diffraction (XRD)? fi
eld emission scanning electron microscopy (FE-SEM), selected area electron
diffraction (SAED) and high-resolution transmission electron microscopy (HR
TEM). FE-SEM images showed that the GaN rings had diameters of about 2 simi
lar to 10 mum. ZRD, SAED and HRTEM indicated that the rings were wurtzite G
aN single crystals.