Excitonic electroabsorption effects in macroscopically aligned carbon nanotubes

宏观排列碳纳米管中的激子电吸收效应

• 批准号: 2321366
• 负责人: Weilu Gao
• 金额: $ 25.07万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2321366&HistoricalAwards=false
• 关键词: Excitonic; electroabsorption; effects; macroscopically; aligned

Non-technical Description Carbon nanotubes have gained tremendous interest as a nanomaterial with potential to enable next generation optoelectronic devices. Individual nanotubes have a strong change in light absorption under an applied electric field, a phenomenon called electroabsorption. This makes them a promising candidate for high-speed electro-optic modulators, crucial components for applications such as optical communication, computing, and quantum information processing. Key to leveraging nanotube properties will be to align large numbers of them up to macroscopic scales. This project will use an intelligent autonomous self-assembly system to achieve macroscopically aligned semiconducting carbon nanotube films and then study their electro-optical properties. The research findings from this project could lead to a new material platform and lay the foundation for future technologies. The PI will also work to expand participation in STEM through training and education activities in the laboratory, classroom, and through outreach programs. The goal of these activities is to develop a diverse future STEM workforce. Technical DescriptionElectroabsorption in conventional bulk semiconductors result in weak optical modulation, requiring large driving electric field and switching energy, and are sensitive to temperature variations. Semiconductor quantum wells can address first two challenges but still suffer from sensitive temperature dependency, require sophisticated manufacturing and engineering, and sometimes cryogenic device operations. Nanomaterials are emerging as new high-performance, versatile, and easy-to-manufacture room-temperature material platforms. However, current demonstrations of electroabsorption effects in macroscopic materials are limited. This project focuses on the direct experimental optical spectroscopy demonstration of the excitonic electroabsorption effects in macroscopic films of highly aligned and densely packed single-type semiconducting carbon nanotubes, which are manufactured through a self-assembly system and driven under static electric field. The goal of this project is to establish the manufacturing platform of such macroscopic carbon nanotube ensembles and explore the optical spectroscopy evidence of their electroabsorption effects. Specifically, the principal investigator develops a closed-loop, automatic, and machine-learning-assisted vacuum filtration system toward the fabrication of macroscopic films of aligned single-electronic-type carbon nanotubes. In addition, the principal investigator performs optical spectroscopy studies to explore electroabsorption effects in aligned films of a few representative semiconducting carbon nanotubes with different diameters.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术描述碳纳米管作为一种纳米材料引起了极大的兴趣，有可能使下一代光电设备能够。单个纳米管在施加的电场下的光吸收有很大变化，这是一种称为电吸附的现象。这使它们成为高速电光调制器的有前途的候选人，对于光学通信，计算和量子信息处理等应用的关键组件。利用纳米管特性的关键将是将大量的纳米管特性与宏观尺度相提并论。该项目将使用智能的自主自动组装系统来实现宏观对齐的半导体碳纳米管膜，然后研究其电光特性。该项目的研究结果可能会导致一个新的材料平台，并为未来的技术奠定基础。 PI还将通过实验室，教室和外展计划中的培训和教育活动来扩大STEM的参与。这些活动的目的是发展多样化的未来STEM劳动力。 技术描述在常规散装半导体中的电气吸收导致光学调制弱，需要大型驱动电场和开关能量，并且对温度变化很敏感。半导体量子井可以应对第一个挑战，但仍遭受敏感的温度依赖性，需要复杂的制造和工程，有时甚至是低温设备操作。纳米材料正在作为新的高性能，多功能和易于制造的室温材料平台而出现。然而，当前在宏观材料中电吸收效应的证明是有限的。该项目的重点是直接实验光谱谱图证明了高度排列和密集包装的单型单型半导体碳纳米管的宏观膜中激素电吸附效应的直接实验光谱，这些效应是通过自组装系统制造的，这些碳纳米管是通过自组装系统制造的，并在静态电场下进行了驱动。该项目的目的是建立此类宏观碳纳米管合奏的制造平台，并探索其电吸附效应的光谱证据。具体而言，主要研究人员开发了一个闭环，自动和机器学习辅助的真空过滤系统，以制造对齐的单电子型碳纳米管的宏观膜。此外，首席研究者还进行了光谱研究，以探索一些具有不同直径的代表性半导体碳纳米管的对准膜中的电吸附效应。该奖项反映了NSF的法定任务，并通过基金会的知识优点和广泛的影响来评估NSF的法定任务，并被认为是值得通过评估的支持。