GaN nanorings: Another example of spontaneous polarization-induced nanostructure

Disket-Nanorings of K2Ti6O13 Formed by Self-Spiraling of a Nanobelt

“…Then, the mixture was placed in a combustion boat and annealed in a tube furnace at 800°C for 3 h and subsequently cooled naturally to room temperature. The resulted powders were washed with distilled water several times to remove remaining KCl and K 2 C 2 O 4 .…”

Growth of AlN nanobelts, nanorings and branched nanostructures

“…The diameters of the nanorings are about 2.8 m and 4.4 m, respectively. According to the above TEM analysis and previous report of ZnO nanorings [25], the formation of AlN nanoring can be interpreted on the basis of electrostatic polar charge model that has been employed to illustrate the formation of ZnO, AlN and GaN nanorings [22,25,26]. In brief, the top/bottom surfaces of the ±(0 0 1) dominated AlN nanobelts would be charged with positive and negative charges by spontaneous polarization due to its noncentral symmetry structure.…”

Solution phase synthesis of Na0.28V2O5 nanobelts into nanorings and the electrochemical performance in Li battery

“…Nowadays more and more attention has been paid to ring-like nanomaterials due to their size, special morphology related properties and potential nanoscale applications. For example nanorings of ZnO [2], GaN [24], Ga 2 O 3 [25], SnO [3], InGaN [26], BN [27] etc., were synthesized through a high temperature solid state reaction method. This method needs high temperature or special equipment or conditions.…”