Preparation Of Several Crystalline Two-dimensional Materials And Their Energy Conversion And Catalytic Application

Two-dimensional(2D)materials have unique planar topological structure,which results in the excellent optical,electrical and catalytic properties.And they are expected to overturn peoples cognition of traditional materials.At the same time,they are also an important direction of current and future material science research.So far,there are relatively few reports on 2D materials,which are still lack of efficient preparation methods,clear structure-activity relationship and broad application scope.Therefore,it is very important to develop new preparation methods,synthesize highly crystalline 2D materials and broaden the application of two-dimensional materials.In this paper,two kinds of crystalline 2D materials were constructed at the interface and in the solution.And their structure,catalytic and photothermal transformation properties were studied.Also besides,their catalytic mechanism and photothermal transformation principle were clarified,and they were successfully applied to enzymatic catalysis and seawater desalination.The thesis is mainly composed of the following parts: The thesis is mainly composed of the following parts:In the first chapter,this part summarizes the preparation methods,properties and application research of 2D materials and crystal engineering material.And then we put forward the problem.that the 2D materials are remain lack of synthesis method,versatility and crystallinity of the two-dimensional material,which cant meet the high efficient preparation.In addition,we also have been clear about using the metal displacement reaction to improve the preparation methods of inorganic two-dimensional materials and utilizing the eutectic strategy for the synthesis of new crystal 2D materials and developing highly efficient synthesis crystallization method and application of 2D materials.In the second chapter,We explored an interfacial synthesis of 2D 2Pb CO3·Pb(OH)2 nanosheets with an average thickness of 3.3 nm at the gas/liquid interface.The single crystal nanosheets are regular hexagons with the edge length ranging from 1 to 10 ?m.The as-prepared 2D nanosheets were further used as a catalyst for the oxidation reaction.The experimental results revealed that the 2D nanosheets have an intrinsic enzyme mimetic activity similar to that of peroxidases,which are common in nature.The ultrathin 2D nanosheets prepared via an interfacial synthesis procedure exhibit catalytic activity superior to that of commercial 2Pb CO3·Pb(OH)2 powder.In the third chapter,we synthesize a kind of two-dimensional eutectic according to the donor-acceptor interaction.The linear donor tetrathiafulvalene(TTF)and triangular receptor cyclic trimeric pyromellitic diimide(Tri-PMDI)had obvious charge transfer and formed a quasi-two-dimensional charge transfer complex with good near-infrared photothermal conversion efficiency.In the simulated seawater desalination experiment,the seawater evaporation efficiency was increased to 46.2%.In chapter 4,we synthesised a two-component 2D organic materials based on ?-? interaction.The cyclic trimeric naphthalene diimide(Tri-PNDI)and planar pyrene form a two-dimensional network.There is also a strong charge transfer between them.And the electrical properties of 2D single crystal organic frameworks remain to be studied.