Solvothermal Synthesis of Bi2Se3 Hexagonal Nanosheet Crystals
Bismuth selenide (Bi2Se3) hexagonal nanosheet crystals with uniform size were successfully prepared via a solvothermal method at 160°C for 22 h using bismuth trichloride(BiCl3) and selenium powder(Se) as raw materials, sodium bisulfite(NaHSO3) as a reducing agent, diethylene glycol(DEG) as solvent, and ammonia as pH regulator. Various techniques such as X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), high-resolution transmission electron microscope (HRTEM), and selected area electron diffraction (SAED) were used to characterize the obtained products. Results show that the as-synthesized samples are pure Bi2Se3 hexagonal nanosheet crystals. A possible growth mechanism for Bi2Se3 hexagonal nanosheet crystals is also discussed based on the experiment.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
H. T. Liu et al., "Solvothermal Synthesis of Bi2Se3 Hexagonal Nanosheet Crystals", Advanced Materials Research, Vols. 236-238, pp. 1712-1716, 2011