Preparation And Research Of Bismuth Sulfide Nanomaterials With Different Morphologies

In this paper, Bi2S3 nanomaterials with different morphologies were synthesized by microwave irradiation, fluxing, solvothermal method and hydrothermal method. The products were characterized by SEM, TEM, HRTEM, XRD and UV-Vis. This main content includes four parts:synthesis of Bi2S3 nano-flowers by docomposing single-source precursor under microwave irradiation; preparation of Bi2S3 nanoflowers by hydrothermal method; synthesis of Bi2S3 nanorods at the interface of two immiscible liquids; preparation of Bi2S3 nanoflowers by fluxing single-source precursor method.Bismuth trisulfide (Bi2S3) nanomaterials with flowers-like morphologies have been successfully synthesized by microwave irradiation method, using Bi(S2CNEt2)3 as raw materials and ethylene glycol as solvent. X-ray diffraction (XRD) indicates that the obtained sample is orthorhombic phase with calculated lattice parametersα=0.4011 nm,b=1.114 nm, and c=1.136 nm. Scanning electron microscopy (SEM) and transmission electron microscope (TEM) images show that Bi2S3 is flower-like morphology, and each flower-like structure composed of nanorods with diameters ranging from 80 to 135 nm and with length ranging from 0.9μm to 1.5μm. UV-Vis analysis indicates that the band gap of Bi2S3 nanoflowers is 1.72 eV. Radiation time, solvent and surfactant have influence on the morphologies of the products.Bismuth sulfide nano-flowers have been prepared by hydrothermal method, using bismuth chloride and sodium thiosulphate as source materials, poly(vinyl alcohol)-124 as a capping reagent. X-ray diffraction indicates that as-prepared product is orthorhombic-phase Bi2S3 with calculated lattice parametersα=0.3982 nm, b=1.113 nm, c=1.132 nm. Scanning electron microscopy image (SEM) shows that the flower-like Bi2S3 is composed of nano-sheets with 50～80 nm in thick. The observations of TEM and HRTEM also confirmed the result. In addition, the effects of time, temperature and different dosage of poly(vinyl alcohol)-124 were also investigated. UV-Vis analysis indicates that the band gap of Bi2S3 nanostructures is 1.55 eV.Bismuth sulfide nanorods have been prepared by two-phase interface method, using bismuth nitrate and carbon disulfide as source materials. The nanorods are typically 50～200 nm in diameter and 0.9-2.5μm in length. The structure, phase and morpholgies of the products were observed by XRD, SEM, TEM, HRTEM and UV-Vis. The results show that the Bi2S3 nanorods are orthorhombic phase with cell parameters ofα=0.3981 nm,b=1.105 nm, and c=1.134 nm. The influences of reaction time, reaction temperature and biphase interface on the morphology of Bi2S3 nanorods were also researched. UV-Vis analysis shows that Bi2S3 nanorods are semiconductor with bandwidth Eg 1.57 eV.Bi2S3 nano-flowers were successfully synthesized via refluxing method, using Bi(S2CNEt2)3 as starting material, ethylene glycol as solvent. Bi(S2CNEt2)3 was prepared using Bi(NO3)3·5H2O and Na(S2CNEt2)·3H2O as source materials. The products were characterized by XRD, SEM, TEM, HRTEM, SAED and UV-Vis techniques. The results indicate the Bi2S3 nano-flowers are orthorhombic phase and are composed of Bi2S3 nanorods with 70～130 nm in diameter and 0.2～0.5μm in length extending radially from a nucleation site. UV-Vis analysis exhibits that the bandwidth of urchinlike Bi2S3 is 1.62 eV.