CdS/MnS多重异质结纳米棒的合成及高压研究

Studies on nanomaterials with special structures and morphologies have caused extensive concerns of scientists. In this project, we intend to systematically investigate the controllable synthesis, magneto-optical properties and applications of one-demensional CdS/MnS multiple heterostructure nanorods. Theoretical simulations will be conducted to explore the photon-generated carrier dynamic effects as a result of band offset and lattice strain between CdS and MnS nanocrystals. Meanwhile, it is anticipated to realize the energy band modulation of CdS/MnS multiple heterostructure nanorods by applying diamond anvil cell, which is monitored by combining in situ high-pressure spectroscopic technique with synchrotron radiation X-ray diffraction measurements. We further explore the high-pressure stability, shape evolution as well as physical mechanisms of one-demensional confined CdS/MnS multiple heterostructure nanorods. Finally, we are encouraged to retain the new high-pressure phase nanomaterials with excellent performance. The project will expand the field of high-pressure nanoscience, and provide the theory and practical foundation for the further exploration of this edge interdiscipline. It is of great scientific significance for expanding the research of condensed matter under extreme conditions.

对于特殊结构和形貌的纳米材料的研究已引起科学家们的广泛关注。本项目拟系统地研究一维CdS/MnS多重异质结纳米棒的可控制备、磁光性质及其光电器件应用，结合理论计算模拟探索能带偏移和晶格应力对异质结纳米棒的光生载流子动力学的影响，并进一步利用金刚石对顶砧压机，结合原位高压光谱学技术和原位高压同步辐射XRD测量手段，研究高压下CdS/MnS多重异质结纳米棒的能带调制，探索一维限域条件下CdS/MnS多重异质结纳米棒的高压结构稳定性及形貌变化规律和物理本质，尝试“截获”具有优异性能的高压新相纳米材料，为进一步深入开展这一交叉学科的探索提供理论及实践基础，对拓展极端条件下的凝聚态物质研究具有重要的科学意义。

压力是独立于温度、组分的影响物质结构和性质的基本变量，并在科学研究中起着越来越重要的作用。在本项目的资助下，我们利用金刚石对顶砧压机，结合自主设计搭建的原位高压吸收、发射和荧光寿命等实验测量系统，以及原位高压同步辐射X射线衍射测量手段，实现了不同结构的闪锌矿和纤锌矿硒化镉纳米晶的原位高压带隙调制，成功地“截获”了体材料中所不存在的高压新相B31相硫化锰，探讨了所制备的纳米材料在低维限域条件下的高压结构稳定性、形貌变化规律和物理本质，并发现了一些新的纳米限域体系在高压下的新结构和性质，详细讨论了高压作用下物质相变与能级结构和光电性质的构效关系，为深入开展一维异质结材料的高压研究提供了重要的数据支撑和技术保障，也为设计和制备新型功能纳米材料拓展了新的思路和方法。在本项目的支持下，发表标注本项目资助的高水平SCI检索文章11篇，其中包括J. Am. Chem. Soc. 2篇，Angew. Chem. Int. Ed. 1篇，J. Mater. Chem. A 1篇，Nanoscale 5篇，J. Phys. Chem. C 1篇，ACS Sustainable Chem. Eng. 1篇，顺利完成了任务书中规定的考核指标。