Studies On The Controllable Synthesis Of Transition Metal Oxides And Their Interfacial Properties

The controllable synthesis of nanomaterials and the regulation of their interfacial properties has emerged as a hot topic in the field of nanoscience,because their physical and chemical properties are closely related to the interfacial atomic arrangement and electronic state.In this regard,study on surface and interface properties bear great significance,which helps us to understand the interaction of nanocrystals as well as construct new functional composite materials.From this point,this dissertation focuses on the research of interface modification,surface coating,ion doping effect and the heterogeneous structure based on the controllable synthesis of transition metal oxides nanocrystalline,emphasizing on a new method for the construction of the interface and expanding the novel application of nanostructures.A novel thermite membrane was prepared based on the electrostatic interaction and self-assembly method.The aluminum nanoparticles are uniformly embedded into one dimension-based membrane.After surface modification,the wetting behavior of thermite membrane can be changed into super hydrophobic and the friction sensitivity of thermite membrane was detailed investigated.In addition,hierarchical MnO2/SnO2 heterostructure was prepared by hydrothermal method.The activation energy and the temperature of exothermic peak of ternary thermite membrane were further discussed.A general strategy toward versatile encapsulations of inorganic nanocrystals,through a green hydrothermal treatment of commercial polyurethane sponge,was developed.The effects of surface coating on the noble metals in plasma surface resonance and surface enhanced Raman scattering were discussed.At the same time,N-doped carbon coated nanocomposites shows excellent performance in lithium storage.Hierarchical sulfur doped molybdenum oxide ultrafine nanorings have been successfully synthesized through a facile solvothermal approach.Furthermore,the morphology of the final sample can be changed by tuning the amounts of sulfur.Owing to the excellent photo thermal conversion properties,nanorings can effectively convert light energy into heat.In addition,nanorings filled polymer material possesses a special light response performance,which exhibits good shape memory properties,self-healing and reversible deformation under infrared light irradiation.The hierarchical MoSe2 and S-doped MoSe2-x nanostructures have been synthesized though solvothermal method in a mixed solution of octylamine and oleyl alcohol.The assembly structural evolution was observed by sulfur doping.Lithium storage and electrochemical performance for different assemblies were investigated,and the results show that sulfur doping can expose more active sites on the surface of the material,improving its electrochemical catalytic activity.Various Mo-based heterogeneous structures were prepared through pyrolysis method.Compared to the corresponding monometal oxides,heterogeneous structure exhibit enhanced electrocatalytic performance owing to the specific synergy.This method provides a new method for the preparation of new nanocomposites.