Preparation of Bi_2S_3 nanorods via a hydrothermal approach

摘要

Large-scale bismuth sulfide (Bi_2S_3) nanorods with uniform size have been prepared by hydrothermal method using bismuth chloride (BiCl_3) and sodium sulfide (Na_2S·9H_2O) as raw materials at 180℃ and pH = 1-2 for 12 h. The powder X-ray diffraction (XRD) pattern shows the Bi_2S_3 crystal belongs to the orthorhombic phase with calculated lattice constants a = 1.1187 nm, b = 1.1075 nm and c = 0.3976 nm. Furthermore, the quantification of X-ray photoelectron spectra (XPS) analysis peaks gives an atomic ratio of 1.9:3.0 for Bi:S. Field emission scanning electron microscopy (FE-SEM) and transmission electron microscopic (TEM) studies reveal that the appearance of the as-prepared Bi_2S_3 is rod-like with typical lengths in the range of 2-5 μm and diameters in the range of 10-30 nm. Finally the influences of the reaction conditions are discussed and a possible mechanism for the formation of Bi_2S_3 nanorods is proposed.