The Effect of Reaction Temperature on the Particle Size of Bismuth Oxide Nanoparticles Synthesized via Hydrothermal Method

摘要

Bismuth oxide (Bi_2O_3) nanoparticles have been synthesized at different temperatures from 70 to 120°C without any subsequent heat treatment using hydrothermal method. The particle size, and crystal structure of as-synthesized particles were investigated by X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Energy-dispersive X-ray spectroscopy (EDX) and Fourier transform Infra-Red (FTIR). The nanoparticles are of a pure moniclinic Bi_2O_3 phase with rods shape. The average size of nanoparticles increases with the increase of reaction temperature. It was clear that longer reaction temperature allows precipitation completely occured and form larger nanoparticles (NPs). The crystallinity of Bi_2O_3 also are of high purity even at lower reaction temperature. The FTIR spectrum showed the absorption band at 845 cm~(-1) which is attributed to Bi-O-Bi bond, and the strong absorption band recorded at 424 cm~(-1)that is due to the stretching mode of Bi-O.