Hydrothermal Synthesis of Bismuth Sulfide (Bi_2S_3) Nanorods: Bismuth(III) Monosalicylate Precursor in the Presence of Thioglycolic Acid

摘要

Well-segregated bismuth sulfide (Bi_2S_3) nanorods with a high order of crystallinity have been successfully prepared from bismuth(III) monosalicylate [BiO(C_7H_5O_3)] by a simple hydrothermal reaction in H_2O at 180 °C. Bismuth(III) monosalicylate and thioglycolic acid act as the starting materials. The products were characterized by powder X-ray diffraction, Ultraviolet-Visible (UV-Vis) spectroscopy, transmission electron microscopy photoluminescence spectroscopy, and Fourier transform infrared spectra. The powder X-ray diffraction pattern shows the product belongs to the orthorhombic Bi_2S_3 phase. Their UV-Vis spectrum shows the absorbance at 328 nm, with its direct energy band gap of 2. 6 eV. Bismuth salicylate, which is known to be a complex, may play a critical role as a precursor and a template for the growth of linear bismuth sulfide nanorods. Finally the influences of the reaction conditions are discussed and a possible mechanism for the formation of Bi_2S_3 nanorods is proposed.