MRI: Acquisition of Ultrafast Transient Absorption Spectrometer

该奖项由主要研究仪器（MRI）和化学研究仪器（CRIF）项目支持。埃默里大学的liantianquan教授和他的同事Brian Dyer， Hayk Harutyunyan， Eilaf Egap和Ajit Srivastava已经获得了一个能够在飞秒和纳秒尺度上工作的超快瞬态吸收光谱仪。这种仪器可以帮助研究用于可持续能源开发的材料，这是21世纪科学和技术的“重大挑战”。为了应对这一挑战，需要对新的太阳能转换概念、材料和技术进行创新的基础研究。这需要跨越生物、化学、物理和计算科学的高度多学科的研究努力。先进功能材料的成功开发需要了解材料、催化剂（酶）及其界面中光能、电能和化学能相互转换的基本过程。探测这些基本过程需要先进的光谱技术，具有足够的时间、光谱和空间分辨率和可调性。所要求的光谱仪和相关的用户设施提供了这种能力，并大大加强了埃默里大学和附近亚特兰大地铁和美国东南部机构的博士后和本科生和研究生的太阳能研究和培训，包括历史上的黑人学院和大学（HBCUs）。光谱仪加强了各级的研究和教育。该仪器被用于多种研究，如巨振子强度跃迁效应在胶体、二维镉硫系纳米片中的相关能量研究；二维过渡金属二硫系异质结构中激子动力学的研究并对纳米晶体/氢化酶杂化光催化中驱动产氢反应的机理进行了研究。该光谱仪还用于研究量子点/共轭聚合物配合物中三重态Dexter能量转移机制，以及研究金属/半导体界面等离子体诱导的热电子转移机制。

This award is supported by the Major Research Instrumentation (MRI) and the Chemistry Research Instrumentation (CRIF) Programs. Professor Tianquan Lian from Emory University and colleagues Brian Dyer, Hayk Harutyunyan, Eilaf Egap and Ajit Srivastava have acquired an ultrafast transient absorption spectrometer capable of acting on the femtosecond and nanosecond scales. This instrumentation may aid in studying materials used in the development of sustainable energy which is a "Grand Challenge" for science and technology in the 21st century. To meet this challenge, innovative basic research into new solar energy conversion concepts, materials and technologies is needed. This requires highly multidisciplinary research efforts that span the biological, chemical, physical and computational sciences. The successful development of advanced functional materials requires understanding of fundamental processes involved in the interconversion of light, electrical, and chemical energy in materials, catalysts (enzymes) and at their interfaces. Probing these fundamental processes requires advanced spectroscopic techniques with sufficient time, spectral and spatial resolution and tunability. The requested spectrometers and associated user facility provide this capability and greatly enhance solar energy research and training of postdoctoral fellows and undergraduate and graduate students at Emory and nearby institutions in the metro Atlanta and southeastern USA, including historically black colleges and universities (HBCUs).The spectrometer enhances research and education at all levels. The instrument is used in a variety of investigations such as the examination of the giant oscillator strength transition effects in colloidal, two-dimensional cadmium chalcogenide nanoplatelets of relevance in energy research; studies of exciton dynamics in two-dimensional, transition metal dichalcogenide heterostructures; and the determination of mechanisms of light-driven hydrogen-generating reactions in nanocrystal/hydrogenase hybrid photocatalysis. The spectrometer is also used in investigating the mechanism of triplet Dexter energy transfer in quantum dot/conjugated polymer complexes and in studying the mechanism of plasmon-induced hot electron transfer at a metal/semiconductor interfaces.