The effect of temperature on Bi_2Se_3 nanostructures synthesized via chemical vapor deposition

摘要

Bismuth selenide (Bi_2Se_3) nanostructures have been synthesized via chemical vapor deposition at different temperatures. In order to reduce the Se vacancy in Bi_2Se_3, the ultrapure Bi_2Se_3 mixed with the Se powder source is used to supply a sufficient selenium atmosphere. The crystallization, composition, morphology of the products effected by temperature were characterized by XRD, SEM, EDX, HRTEM, SAED and Raman. The results show that the nanostructures of Bi_2Se_3 deposited at 500 ℃ is optimized in our experimental conditions. Meanwhile, it provided an evidence to synthesize Bi_2Se_3 nanostructures, which is more advantageous to investigate the exotic surface states and potential applications in spintronics.