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Solvothermal Synthesis and Mechanism of sulfide nano- and microcrystalline materials

Author: LiuXinZheng
Tutor: QianYiTai
School: University of Science and Technology of China
Course: Inorganic Chemistry
Keywords: Nanowires Hollow ball Microcrystalline material Nanocrystalline Nano-materials Solvothermal Synthesis Nano-powder Layered structure Crystal structure Precursor
CLC: O611.3
Type: PhD thesis
Year: 2006
Downloads: 645
Quote: 3
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Abstract


In this dissertation, hydrothermal and solvothermal technique for the synthesis of inorganic materials were developed. we report a solvothermal route to synthesize Bi2S3 nanowires adopting an inorganic-surfactant （BiCl4--CTA+） lamellar structure as precursors and water, ethanol as solvents respectively. CdS nanocrystals were synthesized in hydrothermal systems and then were recrystallized to obtain CdS hexagon tubular microcrystals. The ZnS hollow microspheres composed by many small ZnS nanoparticles were synthesized successfully in hydrothermal-ethanol systems and the gas SO2 produced in our reaction process acted as a soft template. The good disperse MnFe2O4 nanocrystals were synthesized successfully in hydrothermal-glycol systems adopting MnO（OH） nanowires as precursors by a modifying co-precipitation method. The main points can be summarized as follows:1. The surfactants are introduced into the solvothermal technique. It was reported that the BiCl4- could react with CTA+ to form BiCl4--CTA+ lamellar structure. we adopted the lamellar BiCl4--CTA+ as a precursor for formation the lamellar Bi2S3 firstly. Moreover, much evidence demonstrates that lamellar structures, regardless of whether they are natural or artificial, have a strong tendency to form wires or tubes. With the increase of the reaction time, the lamellar Bi2S3 begin to roll onto them and formed nanowires bundles. And finally the naowires bundles were separated to form uniform single nanowires. This reliable method can be controlled and is expected to be applicable to the preparation of 1D nanostructures of other inorganic compounds, such as the Sb2S3 nanowires in our experiment.2. Hydrothermal preparative technique was developed. CdS nanocrystals were firstly synthesized, and then recrystallizing the nanocrystals by controlling the temperarure, mineralizer concentration and the fill factor grew the hexagon

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Chemical elements and inorganic compounds > Nature
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