二维材料因电子高度二维限域化、大比表面积及表面原子高度暴露等优势，展示出新颖的理化特性，成为新能源、光电等应用的理想材料。其组分、晶体工程引起的层内异质界面及掺杂协同调控合成是关键科学问题。本项目拟设计金属离子与二维半导体材料之间的阳离子交换反应，液相法制备层内异质界面可控的二维异质纳米晶（CdX/Cu2X、CdX/ZnX异质纳米结构）并协同实现原子级精度的掺杂。结合球差TEM、EXAFS、KP-FM、时间分辨瞬态吸收谱等高分辨异质界面结构及性能表征，在n型/p型导电、界面载流子传递等光生载流子性质研究基础上，研究其引起的异质界面能带和掺杂能级结构的协同调控、及光电催化等性能的应用。通过原子级精细结构调控引起的“结构-能级-性能”构效关系研究，为其在光电新能源应用奠定新材料基础。

The two-dimensional (2D) feature is unique and indispensable to access unprecedented physical, electronic, and chemical properties due to electron confinement in two dimensions. Controllable synthesis 2D II-VI semiconductor based hetero-nanocrystals and achieving the precise modulation of hetero-interface energy band structure are the critical bottlenecks for wide application of 2D II-VI semiconductor hetero-nanocrystals in catalyze, photoelectricity applications. In the proposed project, based on the designing the liquid soft acid-base coordination reactions between host metal ions and the 2D II-VI semiconductor metal ions, achieving the atomically tunable synthesis of hetero-structure CdX/Cu2X, CdX/ZnX 2D lateral hetero-nanocrystals. By utilizing spherical aberration corrected TEM, EXAFS, Kelvin probe force microscope and femtosecond time-resolved transient absorption, based on the studies of extra electrons (n-type doping) or extra holes (p-type doping), mobility of photon-generated carrier, we will achieve the precise ontrol of hetero-interface energy band and doping energy band structure. Exploring the intrinsic microstructure-activity relationship between the interfacial structure, energy band and apparent luminescence performances of the 2D hetero-structured functional nanomaterials systematically, and realizing wider applications of the 2D hetero-structured nanomaterials in the photoelectrocatalysis application.