MRI: Acquisition of Ultrafast Transient Absorption Spectrometer

MRI：购买超快瞬态吸收光谱仪

• 批准号: 1726536
• 负责人: Tianquan Lian
• 金额: $ 35万
• 依托单位: Emory University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1726536&HistoricalAwards=false
• 关键词: MRI; Acquisition; Ultrafast; Transient; Absorption

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.

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 Tianquan Lian 教授及其同事 Brian Dyer、Hayk Harutyunyan、Eilaf Egap 和 Ajit Srivastava 获得了一种能够在飞秒和纳秒尺度上工作的超快瞬态吸收光谱仪。该仪器可能有助于研究可持续能源开发中使用的材料，这是 21 世纪科学技术的“巨大挑战”。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基础研究。这需要跨生物、化学、物理和计算科学的高度多学科研究工作。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、电和化学能相互转化的基本过程。 探测这些基本过程需要具有足够时间、光谱和空间分辨率以及可调谐性的先进光谱技术。所需的光谱仪和相关用户设施提供了这种功能，并极大地增强了埃默里大学以及亚特兰大都会区和美国东南部附近机构（包括历史悠久的黑人学院和大学 (HBCU)）的博士后研究员、本科生和研究生的太阳能研究和培训。光谱仪增强了各个级别的研究和教育。该仪器用于各种研究，例如检查与能源研究相关的胶体二维镉硫族化物纳米片中的巨型振荡器强度转变效应；二维过渡金属二硫族化物异质结构中的激子动力学研究；以及确定纳米晶体/氢化酶混合光催化中光驱动的产氢反应的机制。该光谱仪还用于研究量子点/共轭聚合物复合物中三线态 Dexter 能量转移的机制，以及研究金属/半导体界面处等离激元诱导的热电子转移的机制。

项目成果

Enhanced triplet state generation through radical pair intermediates in BODIPY-quantum dot complexes

• DOI: 10.1063/1.5136045
• 发表时间: 2019-12-28
• 期刊: JOURNAL OF CHEMICAL PHYSICS
• 影响因子: 4.4
• 作者: Jin, Tao;Uhlikova, Natalie;Lian, Tianquan
• 通讯作者: Lian, Tianquan

Effect of Surface Ligand on Charge Separation and Recombination at CsPbI 3 Perovskite Quantum Dot/TiO 2 Interfaces

表面配体对CsPbI 3 钙钛矿量子点/TiO 2 界面电荷分离和复合的影响

• DOI: 10.1021/acs.jpcc.9b06725
• 发表时间: 2019
• 期刊: The Journal of Physical Chemistry C
• 作者: Shang, Qiongyi;Piercy, Brandon D.;Losego, Mark D.;Lian, Tianquan
• 通讯作者: Lian, Tianquan

Time-variant metasurfaces enable tunable spectral bands of negative extinction

• DOI: 10.1364/optica.6.001441
• 发表时间: 2019-11-20
• 期刊: OPTICA
• 影响因子: 10.4
• 作者: Shcherbakov, Maxim R.;Lemasters, Robert;Shvets, Gennady
• 通讯作者: Shvets, Gennady

Synergistic Cascade Carrier Extraction via Dual Interfacial Positioning of Ambipolar Black Phosphorene for High‐Efficiency Perovskite Solar Cells

• DOI: 10.1002/adma.202000999
• 发表时间: 2020-05
• 期刊: Advanced Materials
• 影响因子: 29.4
• 作者: Meng Zhang;M. Ye;Wenlong Wang;Chunyuan Ma;Shun Wang;Qiliang Liu;T. Lian;Jinsong Huang

Trap state mediated triplet energy transfer from CdSe quantum dots to molecular acceptors

• DOI: 10.1063/5.0022061
• 发表时间: 2020-08-21
• 期刊: JOURNAL OF CHEMICAL PHYSICS
• 影响因子: 4.4
• 作者: Jin, Tao;Lian, Tianquan
• 通讯作者: Lian, Tianquan