Small Molecule-assisted Synthesis Of Copper Oxide Micro-nanocrystals And Their Catalytic Properties

Copper oxide is rich in resources,low in cost,and has good performance and wide application prospects in catalysis,sensing,etc.Therefore,research on its micro-and nano-crystals is one of the hot topics in the field of materials science in recent years.Because the nature of nanomaterials depends to a large extent on their size,morphology and composition,controlled synthesis of them has always been a major concern for scientists in the field.The development of synthetic methods of nanocrystals is of great significance for the study of the relationship between the properties and structure of nanocrystals and the preparation of nanocatalysts with excellent properties.In this dissertation,small molecules such as acetonitrile,N,N-dimethylformamide,and methylamine were selected to assist in the synthesis of copper oxide nanocrystals.The morphology of the copper oxide nanocrystals was controlled,and explored the relationship between structure and catalytic properties.The main contents are as follows:?a?The successful control of the interaction between ten different small molecules such as acetonitrile,N,N-dimethylformamide,and methylamine,and sodium dodecyl sulfate and Cu₂O{001},{111}crystal planes with different intensities.The{001}/{111}crystal area ratio of the nanocrystal finally achieved a continuous evolution of the nanocrystal morphology from the cubic to the octahedron.Using DFT,the form and strength of the typical small molecule and Cu₂O crystal plane were calculated,and the mechanism of their control of nanocrystalline morphology of Cu₂O was confirmed.The Ullmann reaction?conjugation of phenol with halogenated benzene to diphenyl ether?was used to evaluate the catalytic performance of different morphologies of Cu₂O,and the corresponding structure-catalytic activity relationship was obtained.?2?Ethylene glycol was used as the main solvent.By adding small molecules to change the reaction and growth environment,different microenvironments promoted the formation of a series of copper oxide micro-and nanocrystals?Cu_XO?with different structures,such as spherical,porous nanospheres and porous nanowires.The Ullmann reaction?conjugation of phenol with halogenated benzene to diphenyl ether?was used to evaluate the catalytic activity of different morphology products.The effect of the structure on the catalytic performance was investigated.