STRUCTURAL ORIGINS IN PHOTOSWITCHABLE ORGANIC FERROELECTRICITY USING TIME-RES

使用时间分辨率的光开关有机铁电结构起源

• 批准号: 8172008
• 负责人: LIN CHEN
• 金额: $ 1.7万
• 依托单位: UNIVERSITY OF CHICAGO
• 依托单位国家: 美国
• 财政年份: 2010
• 资助国家: 美国
• 起止时间: 2010-08-01 至 2011-07-31
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/8172008
• 关键词: Chemicals; Computer Retrieval of Information on Scientific Projects Database; Funding; Grant; Hydrogen Bonding; Information Storage; Institution; Interdisciplinary Study; Molecular Motors; Property; Research; Research Personnel; Resources; Rotation; Side; Source; Techniques; Time; United States National Institutes of Health; Universities; Work; absorption; beamline; chemical synthesis; electron donor; emission spectroscopy; repaired; success; time use

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. Organic ferroelectric materials are important for applications of information storage, molecular motors and actuators. The advantages of organic ferroelectric materials over their inorganic counter part are their chemical tunability, processibility and self-repair capability. Therefore, understanding the structural origins in organic ferroelectric materials and their connections to the properties of the materials is crucial in developing new materials with broad applications. The proposed work will investigate the structural origins of a group of photo-switchable organic ferroelectric materials made of small aromatic organic electron donors (D) and acceptors (A) self-assembled into alternating three dimensional DADA? arrays by steady-state and time-resolved x-ray diffraction techniques at Beamline 14ID of the APS. The structural origins for such photoswitchable ferroelectric materials are structural changes either due to change of the DA distances or rotation of the side groups that form or disrupt the hydrogen bonds. Using TR-XRD, Collet, Techert, et al. carried out pioneering studies on similar type of materials with power diffraction at ESRF. We are encouraged by their success and believe that our materials can be studied by the TR-XRD with Laue diffraction on single crystals at Beanline 14ID. We would like to capture the structural origins that enable the ferroelectricity and distinguish different types of the structural changes. The proposed structural studies will be combined with single crystal ultrafast transient absorption and emission spectroscopy conducted in our labs in Northwestern University. The structural information obtained at the APS and spectroscopic and theoretical as well as chemical synthesis will enable a productive interdisciplinary research to discover, character, and applying new materials.

这个子项目是许多利用 由NIH/NCRR资助的中心赠款提供的资源。子项目和 研究者（PI）可能从另一个NIH来源获得了主要资金， 因此可以在其他CRISP条目中表示。所列机构为 研究中心，而研究中心不一定是研究者所在的机构。 有机铁电材料在信息存储、分子马达和驱动器等方面有着重要的应用。 有机铁电材料相对于无机铁电材料的优势在于其化学可调谐性、可加工性和自修复能力。 因此，了解有机铁电材料的结构起源及其与材料性质的关系对于开发具有广泛应用的新材料至关重要。本论文将研究一类由芳香族有机电子给体（D）和受体（A）自组装成交替三维DADA？阵列的稳态和时间分辨X射线衍射技术在光束线14 ID的APS。这种光可切换铁电材料的结构起源是由于DA距离的变化或形成或破坏氢键的侧基的旋转而引起的结构变化。 Collet、Techert等人利用TR-XRD在ESRF对类似类型的材料进行了开创性的粉末衍射研究。我们对他们的成功感到鼓舞，并相信我们的材料可以在Beanline 14 ID的单晶上通过TR-XRD和劳厄衍射进行研究。我们想捕捉的结构起源，使铁电性和区分不同类型的结构变化。 拟议的结构研究将与我们在西北大学实验室进行的单晶超快瞬态吸收和发射光谱相结合。 在APS和光谱和理论以及化学合成获得的结构信息将使一个富有成效的跨学科研究发现，特性和应用新材料。