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Abstract This paper presents a novel technique to fabricate metallic nanowires in selective areas on a Si substrate. Thermoplastic drawing of viscous metallic glass from cavities etched in Si can produce metallic nanowires. The length and diameter of nanowires can be controlled by adjusting the drawing conditions without changing the Si mold. A thin metal shadow mask is stacked above the Si mold during thermoplastic drawing to fabricate the nanowires only in specific locations. The mask restricts the flow of metallic glass to predefined shapes on the mask, resulting in the formation of nanowires in selected areas on Si. An Al foil-based mask made by a benchtop vinyl cutter is used to demonstrate the proof-of-concept. Even a simple Al foil mask enables the positioning of metallic nanowires in selective areas as small as 200 µm on Si. The precision of the vinyl cutter limits the smallest dimensions of the patterned areas, which can be further improved by using laser-fabricated stencil masks. Results show that a single row of metallic glass nanowires can be patterned on Si using selective thermoplastic drawing. Controllable positioning of metallic nanowires on substrates can enable new applications and characterization techniques for nanostructures.
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This content will become publicly available on June 1, 2026
Fabrication and Characterization of Metallic Glass Nanowire-Anchored Microfluidic Channels
Nanowire-based microfluidic devices combine the strengths of microfluidics and nanostructures for applications in cell biology and chemical sensing. However, their use has been limited by the complexity of the fabrication methods. In this study, we present a simple approach for fabricating and integrating metallic glass nanowires into microfluidic channels. Metallic glass nanowires were formed by thermoplastic drawing on a silicon substrate. The silicon-anchored nanowire array was sealed with a polydimethylsiloxane (PDMS) channel to create a nanowire-integrated microfluidic device. The effect of nanowire geometry on the flowrate was characterized. The experimental results were compared with computational fluid dynamics (CFD) simulations to understand the fluid–nanowire interaction. The potential of surface modification to functionalize the metallic glass nanowires was evaluated.
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- Award ID(s):
- 2212195
- PAR ID:
- 10652835
- Publisher / Repository:
- ASME Digital Collection
- Date Published:
- Journal Name:
- Journal of Micro and Nano Science and Engineering
- Volume:
- 13
- Issue:
- 2
- ISSN:
- 2994-7316
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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