Abstract
Abstarct Hexagonal bismuth telluride (Bi 2 Te 3 ) nanoplates and nanorings were synthesized by a simple solvothermal process. The composition, morphology and size of the as-prepared products were investigated by X-ray diffraction and transmission electron microscopy in detail. The systemically experiments have been performed to investigate the effect of alkaline additive NaOH on composition and morphology of Bi 2 Te 3 nanostructures. The results indicate that alkaline additive NaOH is not necessary for the formation of Bi 2 Te 3 nanostructures in a solvothermal process. However, NaOH plays an important role in determining the morphology and size of Bi 2 Te 3 nanostructures. When the experiment was carried out with NaOH concentration ranging from 5 to 7 M, hexagonal Bi 2 Te 3 nanoplates with edge length of 140–280 nm were synthesized. When the experiment was carried out at higher NaOH concentration of 9–11 M, hexagonal Bi 2 Te 3 nanorings were fabricated by dissolving the inner part of the hexagonal nanoplates with NaOH for the first time. A possible formation mechanism has been proposed based on the experimental results and analysis. This work may open a new rational route for the synthesis of hexagonal Bi 2 Te 3 nanorings which may have some scientific and technological applications in various functional devices.
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