IMR: Development of Instrument: Improving Homogeneity of Quantum Dot Size, Shape, Positioning for Student Training

IMR：仪器开发：提高学生培训的量子点尺寸、形状、定位的均匀性

• 批准号: 0816875
• 负责人: Gregory Salamo
• 金额: $ 16.8万
• 依托单位: University of Arkansas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0816875&HistoricalAwards=false
• 关键词: IMR; Development; Instrument; Improving; Homogeneity

NON-TECHNICAL PROJECT ABSTRACTThis proposal is to develop a new instrument that will allow the fabrication of nanoscale particles with much higher precision and quality. The instrument is designed to deposit uniform nanoscale crystals at specific locations and overcome a roadblock faced by current techniques which produce nanoscale particles with poor size uniformity at 10 to 20% with positioning misalignment of 300 or 400nm. These numbers severely limit the opportunities for innovation using nanoscale materials. In contrast, the proposed instrument is based on a new growth approach which uses a uniquely designed nanoscale nozzle to literally deposit nanostructures with a demonstrated potential for 10 times improvement on current uniformity and precision of location, enabling a new era of nanomaterials and their application. It creates the opportunity to fabricate and explore new materials by grouping nanoscale particles together to form highly organized arrays in chain, molecule, or solid like lattice structures. For example, using this instrument one can construct novel optical and chemical sensor arrays; nanoscale circuits for smaller and more functional electronic devices; or memory arrays that fit right on a processor chip, dramatically increasing the speed of computation devices. The opportunity for innovative material structures with novel properties that can lead to new and better devices is enormous.This proposal will also give graduate and undergraduate students the opportunity to lead the design and fabrication of an exiting new instrument as well as the growth and characterization of unique nanostructures. These students will explore a new path to achieve a more homogeneous array of organized nanostructures and recognize their impact with specific applications.TECHNICAL PROJECT ABSTRACT Although the possibilities from nanotechnology are very exciting they have yet to be fully realized due to the rather large inhomogeneity in the size and shape and random position of nucleation that have persistently accompanied the growth of quantum dots. While efforts to overcome this roadblock have uncovered important basic science as well as techniques to achieve improved homogeneity, nevertheless uniformity remains around 10 to 20% and positioning is limited to the order of the quantum dot size. This proposal is to develop a new instrument based on a relatively new growth approach, ?directed droplet epitaxy?, with the potential for significant improvement on these numbers. This proposal will construct and explore a new instrument to deposit a controlled volume of liquid droplets at specific locations. The technique is based on the simple idea of transferring liquid droplets, through a nanoscale hole in a hollow scanning probe tip, directly onto a substrate before crystallizing. This technique can reduce the inhomogeneity in size as well as random positioning by at least an order-of-magnitude. It opens the possibility of exploring the optical behavior of two QDs with varying distance between them. The cooperative emission, in time, magnitude, and distribution, will be amazing to study. Things even get more exciting as the number of QDs is slowly increased to explore the superradiant emission expected. It makes possible investigating different QD geometrical arrangements or even compositions. It creates the opportunity to explore 2D or 3D QD arrays, or QD arrays with a missing QD. In addition, one can explore quantum wires (QWR), QDs placed in a precise arrangement in an optical cavity, or a new generation of an ?electrical circuit? composed of QDs connected by QWRs. The opportunity for innovative material structures with novel properties is enormous.This proposal will also give graduate and undergraduate students the opportunity to lead the design and fabrication of an exiting instrument as well as the growth and characterization of unique nanostructures. These students will explore a new path to achieve a more homogeneous array of organized nanostructures and recognize their impact with specific applications.

非技术项目抽象的建议是开发一种新工具，该工具将允许制造具有更高精度和质量的纳米级颗粒。 该仪器旨在将均匀的纳米级晶体沉积在特定位置，并克服了当前技术面临的障碍，该技术在10％至20％的尺寸均匀度时产生纳米级颗粒，定位未对准为300或400nm。 这些数字严重限制了使用纳米级材料进行创新的机会。相比之下，提出的仪器是基于一种新的增长方法，该方法使用独特设计的纳米级喷嘴来实现纳米结构，从而在当前均匀性和位置的精度上表现出10倍改善的纳米结构，从而实现了纳米材料的新时代及其应用。它通过将纳米级颗粒分组在一起以形成链，分子或像晶格结构的实心阵列来形成高度有组织的阵列，从而创造了制造和探索新材料的机会。例如，使用此仪器可以构建新型的光学传感器阵列。纳米级电路，用于较小和更具功能性的电子设备；或安装在处理器芯片上的内存数组，大大提高了计算设备的速度。具有新型特性的创新材料结构的机会是巨大的。该建议还将使研究生和本科生有机会领导退出新工具的设计和制造，以及独特的纳米结构的增长和表征。这些学生将探索一条新的途径，以实现各种有组织的纳米结构，并认识到他们在特定应用中的影响。尽管纳米技术的可能性非常令人兴奋，但由于纳米技术的可能性尚未完全实现，因为它们在核定的大小和形状和随机位置上具有良好的成长量的增长，因此尚未完全实现。尽管克服这一障碍的努力已经揭示了重要的基础科学以及提高均匀性的技术，但统一性仍保持在10％至20％左右，定位仅限于量子点大小的顺序。该提议是基于相对较新的增长方法开发一种新的仪器，即“定向液滴外观”，并有可能对这些数字进行重大改进。该提案将构建并探索一种新工具，以将受控量的液滴存放在特定位置。该技术是基于通过空心扫描探针尖端中的纳米级孔转移液滴的简单概念，直接在结晶之前直接到基板上。该技术可以将大小和随机定位的不均匀性减少至少降低。它打开了探索两个QD之间具有不同距离的光学行为的可能性。及时，大小和分布的合作发射将是惊人的。随着QD的数量逐渐增加以探索预期的超级排放，事情甚至变得更加令人兴奋。它可以研究不同的QD几何布置甚至组成。它创造了探索2D或3D QD数组的机会，或带有缺少QD的QD数组。此外，可以探索量子线（QWR），将QD放置在光学腔中的精确排列或新一代电路？由QWR连接的QD组成。具有新颖性能的创新材料结构的机会是巨大的。该提案还将使研究生和本科生有机会领导退出仪器的设计和制造，以及独特的纳米结构的增长和表征。这些学生将探索一条新的途径，以实现更均匀的有组织的纳米结构，并认识到他们在特定应用中的影响。