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Manufacturing of Metal Nanostructures by Tensile Deformation of Liquid Metal Arrays

通过液态金属阵列拉伸变形制造金属纳米结构

基本信息

批准号：
1663568
负责人：
Golden Kumar
金额：
$ 23.12万
依托单位：
Texas Tech 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：
2017-10-01 至 2019-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1663568&HistoricalAwards=false
关键词：
Manufacturing Metal Nanostructures Tensile Deformation

项目摘要

Metal nanostructures are essential for energy conversion and storage, sensors, plasmonics, water purification, and biomedical applications. Despite growing demand in these technologies, the manufacturing methods for metal nanostructures have remained few and often complex. Polymer nanostructures can be massively fabricated by nanoimprinting, template infiltration, and electrospinning. A plethora of top-down (etching) and bottom-up (directed- or self-assembly) techniques have been developed for semiconductor nanostructures to meet the needs of microelectronics industry. In contrast, metal nanostructures still require multiple lithographic and thin film deposition steps which are slow and expensive. This award supports fundamental research in the rheology of liquid metals to advance a new nanomanufacturing technique involving tensile deformation and rupture of arrays of liquid metal. The research enables nanolithography-free fabrication of controllable metal nanostructures assembled on various substrates such as metals, glasses, polymers, and semiconductors. The project provides education and hands-on training in metal nanomanufacturing to undergraduate and graduate students and opportunities in engineering to minority students and students with disability. A variety of shapes such as droplets, thin films, beads-on-a-string, conical structures, and long fibers can be created by deformation of polymer liquids. This is enabled by tuning rheological and interfacial properties of polymer solutions. However, a similar approach is not applicable to liquid metals because of their low viscosity, high surface tension, and lack of viscoelasticity. These challenges of conventional metals are overcome by using amorphous metals or glass forming metal alloys which exhibit a metastable supercooled liquid state that mimics the rheology of thermoplastics. Effects of viscosity, surface tension, and strain-rate on flow behavior of metallic supercooled liquids are systematically studied. Such knowledge is used to manipulate the supercooled liquid state for high-throughput manufacturing of metal nanostructures by mechanical means. The research work involves extensional or tensile deformation of liquid metal arrays to create high-aspect-ratio and hollow metal nanostructures which are not feasible by existing embossing methods. The glassy or amorphous nanostructures are subsequently devitrified or crystallized for applications which require crystalline metal nanostructures. Besides leading to new applications, this nanomanufacturing project enables fundamental studies on size effects in metallic glasses through performance of thermal, electrical, and mechanical tests on nanoscale specimens.

金属纳米结构在能量转换和存储、传感器、等离子体、水净化和生物医学应用中是必不可少的。尽管对这些技术的需求越来越大，但金属纳米结构的制造方法仍然很少，而且往往很复杂。聚合物纳米结构可以通过纳米压痕、模板浸渍和静电纺丝等方法大规模制备。为了满足微电子工业的需要，半导体纳米结构已经发展了大量的自上而下(刻蚀)和自下而上(定向或自组装)技术。相比之下，金属纳米结构仍然需要多个光刻和薄膜沉积步骤，这些步骤既慢又昂贵。该奖项支持液态金属流变学的基础研究，以推进一种新的纳米制造技术，该技术涉及液态金属阵列的拉伸变形和断裂。这项研究使在金属、玻璃、聚合物和半导体等各种衬底上组装的可控金属纳米结构能够在无纳米光刻的情况下制造出来。该项目为本科生和研究生提供金属纳米制造方面的教育和实践培训，并为少数族裔学生和残疾学生提供工程方面的机会。聚合物液体的变形可以形成各种形状，如液滴、薄膜、串珠、圆锥形结构和长纤维。这是通过调节聚合物溶液的流变性和界面属性来实现的。然而，类似的方法不适用于液态金属，因为它们的粘度低，表面张力高，缺乏粘弹性。通过使用非晶态金属或玻璃形成的金属合金来克服传统金属的这些挑战，这些金属合金表现出一种模仿热塑性塑料流变性的亚稳态过冷液态。系统地研究了粘度、表面张力和应变率对金属过冷液体流动行为的影响。这些知识被用来操纵过冷液体状态，以通过机械手段高通量地制造金属纳米结构。研究工作包括对液态金属阵列进行拉伸或拉伸变形，以创建高深宽比的中空金属纳米结构，这是现有压花方法不可行的。玻璃态或非晶态纳米结构随后被非玻璃化或晶化，以用于需要晶态金属纳米结构的应用。除了引领新的应用，这一纳米制造项目还能够通过对纳米级样品的热、电和机械测试来对金属玻璃的尺寸效应进行基础研究。

项目成果

期刊论文数量（4）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Photoinduced heat conversion enhancement of metallic glass nanowire arrays

金属玻璃纳米线阵列的光致热转换增强

DOI：
10.1063/1.5059423
发表时间：
2019
期刊：
Journal of Applied Physics
影响因子：
3.2
作者：
Uzun, Ceren;Meduri, Chandrasekhar;Kahler, Niloofar;de Peralta, Luis Grave;McCollum, Jena M.;Pantoya, Michelle;Kumar, Golden;Bernussi, Ayrton A.
通讯作者：
Bernussi, Ayrton A.

Buckling of metallic glass supercooled liquid layer during embossing