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）计划支持。来自埃默里大学的Tianquan Lian教授及其同事Brian Dyer，Hayk Harutyunyan，Eilaf Egap和Ajit Srivastava获得了一台能够在飞秒和纳秒尺度上发挥作用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，这是世纪科学和技术的“大挑战”。为了迎接这一挑战，需要对新的太阳能转换概念、材料和技术进行创新性基础研究。这需要高度多学科的研究努力，跨越生物，化学，物理和计算科学。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，电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，并大大提高了太阳能研究和博士后研究员和本科生和研究生在埃默里大学和附近的机构在亚特兰大市和美国东南部，包括历史上的黑人学院和大学（HBCU）的培训。光谱仪加强了各级研究和教育。该仪器被用于各种调查，如检查的巨振子强度过渡的影响，在胶体，二维镉硫属化物纳米片的相关性在能源研究;激子动力学的研究，在二维，过渡金属dichalcogenide异质结构;和光驱动的氢产生反应的机制的确定在氢/氢化酶的混合动力学。该谱仪还被用于研究量子点/共轭聚合物复合物中三重态Dexter能量转移的机理以及研究金属/半导体界面等离子体激元诱导的热电子转移的机理。

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.