Conversion of Hexagonal Sb₂Te₃ Nanoplates into Nanorings Driven by Growth Temperature

Abstract

We describe a novel route for the conversion of hexagonal Sb(2)Te(3) nanoplates into nanorings driven by growth temperature in a simple solvothermal process. The transmission electron microscopy was employed to investigate systemically the morphology, size, crystallinity, and microstructure of the as-prepared products. The experiments indicated that the growth temperature had a great effect on the morphology of antimony telluride nanostructures. When the experiments were conducted at 200 °C, the hexagonal antimony telluride nanoplates were obtained. However, if the experiments were carried out at higher temperature of 230 °C, the hexagonal antimony telluride nanorings were achieved by dissolution of the inner part with a higher density of defects of the hexagonal nanoplates for the first time. A possible formation mechanism was proposed on the basis of experimental results and analysis. This work may open a new rational route for the synthesis of the hexagonal antimony telluride nanorings, which may have scientific and technological applications in various functional devices.

Ni(OH)2@Co(OH)2 hollow nanohexagons: Controllable synthesis, facet-selected competitive growth and capacitance property

“…Previous reports indicated that a higher density of imperfections, such as surface roughness, [35] planar defects, [36] and a high surface tension, [38] exist near the center of the nanoplates. The imperfections reduce the dissolution energy of the nanocrystals, and thus a higher dissolution rate is possible in the center of the nanoplates (Figure 3(c)).…”

“…Both internal crystal factors and external factors, such as the additives [32], reaction time [5,33] and reaction temperature [34][35][36] should be considered.…”

The preparation and electrochemical characterization of urchin-like NiCo2O4 nanostructures

“…3g-j, a few microflakes are synthesized on the surface of the CC at the reaction time of 0.5 h. With the increase of the reaction time, the center area of the microflakes becomes gradually thin, and forms a hole at the reaction time of 2.5 h. They are called microring. Whose morphology is analogous to the porous NiCo 2 O 4 hexagonal ring-graphene hybrid [28], which is attributed to the chemical etching induced by the excessive amounts of NH 4 F [29,30]. With the help of NH 4 F, the nanowires will grow on microrings.…”

Microstructure analyses and thermoelectric properties of Ag1−xPb18Sb1+yPerlt1, Höche2, Dadda3 et al. 2012Journal of Solid State Chemistry19030View full textAdd to dashboardCite

“…5(c)) strengthen this assumption. The strainfield surrounding such dislocations could already have been present in the PbTe host lattice providing the location for precipitate formation [14].…”