二维单分子层SnS2/Ag光催化材料的制备及光生电荷行为研究

The two-dimensional (2-D) semiconductor material with a single molecular layer thickness has a highly photocatalytic activity, due to its quantum confinement effect arise from high anisotropy, surface effect, and a very short diffusion distance of photogenerated carriers. This project based on the earth-abundant catalysts SnS2, will prepar monolayer SnS2 by intercalate - exfoliate method, following deposit Ag nanoparticles on SnS2 monolayer surface to forming Ag/monolayer SnS2 composite photocatalyst. We will Studied the formation mechanism of 2-D monolayer SnS2, growth and morphology of Ag nanocrystals on the surface of monolayer SnS2 , and will establish designing theory and method of preparation of Ag/monolayer SnS2 photocatalytic materials. In addition, the separation, recombination and transmission dynamical behavior of photogenerated charges on photocatalysts will be studied, so as to deeply reveal the quantum confinement effect and plasma resonance effect on the behavior of photogenerated charges. This research would provide a new way for constructing high efficient photocatalyst in visible light, but also provides an important reference for deeply understanding the photocatalytic mechanism on 2-D semiconductor surface.

具有单分子层厚度的二维(2-D)半导体材料，由于其高度的各向异性所表现的量子限域效应、表面效应及极短的光生载流子扩散路径，使得这类材料具有很高的光催化活性。本项目以地球上的储量较为丰富SnS2为研究对象，通过插层-剥离法制备单分子层SnS2，再在其表面光诱导还原沉积纳米银，形成Ag/单层SnS2复合光催化剂。研究2-D单分子层SnS2的形成机理、纳米Ag在单层SnS2表面的晶体生长形态，建立设计Ag/单层SnS2光催化材料的制备理论和方法；探讨材料表面光生电荷分离与复合、传输等动力学行为，深入揭示量子限域效应、等离子体共振效应对光生电荷行为的影响机制。本项目的开展，将为构建具有可见光吸收、高催化活性光催化剂提供一条崭新的途径，也为深化认识2-D半导体表面的光催化作用机理提供重要的参考。

具有单分子层厚度的二维(2-D)半导体材料，由于其高度的各向异性所表现的量子限域效应、表面效应及极短的光生载流子扩散路径，使得这类材料具有很高的光催化活性。本项目以地球上的储量较为丰富SnS2为研究对象，通过插层-剥离法制备单分子层SnS2，此方法延伸制备超薄WO3纳米片光催化材料。在二硫化锡纳米片表面通过离子交换法沉积Ag2S，形成Ag2S/SnS2复合光催化剂。研究2-D单分子层SnS2的形成机理、纳米Ag2S在单层SnS2表面的晶体生长形态，建立设计Ag2S/SnS2光催化材料的制备理论和方法；通过化学气相沉积法（CVD）合成具有高反应活性位点的和高可见光俘获能力的SnS2纳米片阵列光阳极。探讨材料表面光生电荷分离与复合、传输等动力学行为，深入揭示能带理论、掺杂对光生电荷行为的影响机制。本项目的开展，将为构建具有可见光吸收、高催化活性光催化剂提供一条崭新的途径，也为深化认识2-D半导体表面的光催化作用机理提供重要的参考。