Hydrothermal Synthesis And Property Research Of Functional Solid State Materials

Recently, with the rapid development of natural science research, functional materials with special optical, electrical, magnetic and catalytic properties have attracted much attention. Hydrothermal synthesis technology, an important means of synthesis, has become the first choice to synthesize most functional materials multicomponent materials and compounds with special structure. The motivation of this dissertation is to explore the potential applications of inorganic and inorganic-organic hybrid materials through the study of structure and properties of inorganic and organic multicomponent materials under hydrothermal conditions. For inorganic system and inorganic-organic hybrid system, we choose metal- organic frameworks and supported noble metal catalyst as the representatives to study. The main works include the following two aspects:(1) Under hydrothermal conditions, we used biphenyl-4,4’-dicarboxylic acid( H2BPDC) and 3,6- di(pyridin-4-yl)- 1,2,4,5-tetrazine(4- PYTZ) as raw materials to synthesize metal- organic frameworks, and made a detail discussion on factors of the reaction conditions, such as reaction temperature, reaction time, reactant concentration, p H value, reaction solvent. And we studied the crystal structure and related properties of the product. The product was characterized by single- crystal X- ray diffraction, X- ray diffraction(XRD), infrared spectroscopy(IR), thermo gravimetric analyzer(TGA) and fluorescence spectroscopy. The tests displayed that we synthesized a three- dimensional(3D) structure of the metal- organic framework of Zn2(BPDC)(IN)2. It exhibits threefold interpenetrated six – connected primitive cubic units(pcu) topology structure and luminescence properties. The reaction raw material 4-PYTZ ligand does not enter into the target product, but converts into IN molecules. We have speculated that organic situ reaction may occur during the hydrothermal condition.(2) We synthesized perovskite La0.75K0.25 Mn O3(LKMO) by hydrothermal method. After the strong acid solution treatment, the La3+, K+ in LKMO dissolved and it exposed the manganese oxides(MO). With the corresponding characterization, we confirmed that MO was Mn O2, with containing trace La3+, K+. Using MO as the carrier, we obtained the supported Ag- MO catalyst by immersion redox. By powder X – ray diffraction(XRD), scanning electron microscopy(SEM), X- ray photoelectron spectroscopy(XPS), we discusses the Ag- MO structure, morphology, and make a prediction on the structure.