Solvothermal Synthesis of Single-Crystal Bismuth Selenide Nanoplates.

Bismuth Selenide (Bi2Se3) nanoplates have been synthesized via a facile solvothermal route using the mixed solvents of ethylenediamine (EN) and ethylene glycol (EG) with the assistant ofpolyvinylpyrrolidone(PVP). The X-ray diffraction and Transmission electron microscopy (TEM) indicate that the nanoplates are well-crystallized single crystals with rhombohedral phase. Scanning electron microscopy (SEM) observations show that the nanoplates have approximate hexagonal outer shape with lateral length of 200–600 nm and thickness of 80–160 nm. The influences of solvents and PVP on the growth of the nanoplates were checked and it is found that EN can facilitate the formation of plate-like morphology while EG and PVP can benefit the uniform hexagonal outer shape. The P-type conduction of the Bi2Se3nanoplates is revealed by Hall measurement. [ABSTRACT FROM AUTHOR]