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Hydrothermal Synthesis of ZnO and ZnS Composite Materials

Author: ZhangCunLei
Tutor: XiZhenQiang
School: Zhejiang University of Technology
Course: Materials Engineering
Keywords: zinc oxide zinc sulfur hydrothermal method nanocomposite material
CLC: TB332
Type: Master's thesis
Year: 2012
Downloads: 16
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Abstract


ZnO and ZnS belong toⅡ-Ⅵwide bandgap semiconductor material. It is widely used inthe optical, electrical and light catalysis and other fields by its unique properties, but their singlematerial properties have been gradually cannot meet the actual production application. It isnecessary to develop a unique and novel physical, chemical properties of compoundsemiconductor materials.Zinc oxide and zinc sulfide nanocomposite material have been investigated and synthesizedin this paper. By a two step hydrothermal method, the sheet nanocomposite materials had beensynthesized successfully, the formation mechanism had been analyzed. Field emission scanningelectron microscope(FESEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(EDS)and UV-visible(UV-Vis) diffuse reflection absorption were used to characterize thesenanomaterials.Furthermore, the energy gap of nanocomposite material have been calculated.One-dimensional nanorods array of ZnO/ZnS core shell structure also was synthesized byhydrothermal method and researched its photocatalytic properties. The main contents aresummarized as follows:The ZnO nanoflower have been prepared by hydrothermal method. The study found thatAl3+have a significant influence on morphology of ZnO but have no effect on phase of zincoxide. The morphology of zinc oxide is nanorod structures in the absence of Al3+. Instead, it isnanoflower structures composed of nanorods in the presence of Al3+that the molar concentrationof1%-5%. With the increase of Al3+content, length of nanorods are more and more short. Al3+changed the growth habit of ZnO crystal.A novel nanosheet structure of ZnO/ZnS composite materials was synthesised by use ofZnO nanoflower and thioacetamide as reactant in a hydrothermal environment. The compositematerials showed irregular shape, thickness of20to30nm and very good transmittance in visiblerange. The energy gap of nanosheet range from3.21eV to3.25eV which depend on S content.Through the regulation of thioacetamide concentration to change the S content, The moreconcentration thioacetamide have, the more the S content. Surface of the nanosheet is became more rough.The vertically aligned ZnO/ZnS array with core-shell structure were synthesized on theglass by hydrothermal growth. It show higher activity in photodegradation of RhB in aqueoussolution compared to one-dimensional nanorods array of ZnO.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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