writer：Zhaoping Liu, Jianbo Liang, Shu Li, Sheng Peng, Yitai Qian*
keywords：bismuth, crystal growth, nanostructures, solvothermal synthesis, sulfide
source：期刊
specific source：Chem. Eur. J. 2004, 10, 634-640.
Issue time：2004年
This article describes a facile solvothermal method by using mixed solvents for the large-scale synthesis of Bi2S3 nanoribbons with lengths of up to several millimeters. These nanoribbons were formed by a solvothermal reaction between BiIII–glycerol complexes and various sulfur sources in a mixed solution of aqueous NaOH and glycerol. HRTEM (high-resolution transmission electron microscopy) and SAED (selective-area electron diffraction) studies show that the as-synthesized nanoribbons had predominately grown along the [001] direction. The Bi2S3 nanoribbons prepared by the use of different sulfur sources have a common formation process: the initial formation of NaBiS2 polycrystals, which serve as the precursors to Bi2S3, the decomposition of NaBiS2, and the formation of Bi2S3 seeds in the solution through a homogeneous nucleation process; the growth of Bi2S3 nanoribbons occurs at the expense of NaBiS2 materials. The growth mechanism of millimeter-scale nanoribbons involves a special solid–solution–solid transformation as well as an Ostwald ripening process. Some crucial factors affect nanoribbon growth, such as, solvothermal temperature, volume ratio of glycerol to water, and the concentration of NaOH; these have also been discussed.