title: Synthesis and growth mechanism of Bi2S3 nanoribbons.
abstract: This article describes a facile solvothermal method by using mixed solvents for the large-scale synthesis of Bi(2)S(3) nanoribbons with lengths of up to several millimeters. These nanoribbons were formed by a solvothermal reaction between Bi(III)-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 Bi(2)S(3) nanoribbons prepared by the use of different sulfur sources have a common formation process: the initial formation of NaBiS(2) polycrystals, which serve as the precursors to Bi(2)S(3), the decomposition of NaBiS(2), and the formation of Bi(2)S(3) seeds in the solution through a homogeneous nucleation process; the growth of Bi(2)S(3) nanoribbons occurs at the expense of NaBiS(2) 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.
authors.affiliation: Structure Research Laboratory and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P R China.
authors.forename: Zhaoping
authors.initials: Z
authors.lastname: Liu
authors.forename: Jianbo
authors.initials: J
authors.lastname: Liang
authors.forename: Shu
authors.initials: S
authors.lastname: Li
authors.forename: Sheng
authors.initials: S
authors.lastname: Peng
authors.forename: Yitai
authors.initials: Y
authors.lastname: Qian