Synthesis and Raman scattering of GaN nanorings, nanoribbons and nanowires

Single-crystalline wurtzite GaN nanowires and zigzagged nanostructures fabricated by sublimation sandwich method

“…The peaks are asymmetric and more broadening, and three modes including E 2 (low), A 1 (TO) and A 1 (LO) are large red-shift compared with the peaks from the wurtzite GaN bulk and epitaxial film data [27]. It is thought that the red-shift of these modes results from the size confinement effects and internal stress [28][29][30]. An interesting phenomenon is that four additional modes are also observed at 230.4, 422.6, 839.1 and 968.2 cm −1 , respectively, which is not allowed by the wurtzite-type structure.…”

GaN nanorings: Another example of spontaneous polarization-induced nanostructure

“…Researches on ZnO nanostrctures [13][14][15][16] indicated that the nanoscale polarization is of importance for the formation of those nanostructures, but, the work on GaN nanostructures has not been reported, up to now. Ring-like 1D nanostructures of GaN were shown in previous reports [25][26][27][28]. Nevertheless, the detailed morphological and microstructural features have not been examined and their growth mechanism is still not clearly presented.…”

Synthesis of Ba1+xV6O16·nH2O single-crystalline nanobelts and seamless ring-like structures

“…All the peaks in Fig. 1A can be indexed to the anorthic crystalline phase of Ba 3 (V 10 19 . Interestingly, the intensity of (0 0 2) planes in Fig.…”

“…Subsequently, increased considerable efforts have been focused on the synthesis of other semiconductor materials and the research of novel properties. Until now, the main method to synthesize ring-like structures has been thermal evaporation and the main ring-like materials are metal oxides [9][10][11].…”