Research Papers

Scalable Manufacturing of Metal Nanoparticles by Thermal Fiber Drawing

[+] Author and Article Information
Jingzhou Zhao, Abdolreza Javadi, Ting-Chiang Lin, Injoo Hwang, Yingchao Yang, Zeyi Guan

Department of Mechanical and
Aerospace Engineering,
University of California at Los Angeles,
Los Angeles, CA 91745

Xiaochun Li

Department of Mechanical and
Aerospace Engineering;
Department of Materials
Science and Engineering,
University of California at Los Angeles,
Los Angeles, CA 91745

1Corresponding author.

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MICRO- AND NANO-MANUFACTURING. Manuscript received June 3, 2016; final manuscript received August 30, 2016; published online October 10, 2016. Assoc. Editor: Rajiv Malhotra.

J. Micro Nano-Manuf 4(4), 041002 (Oct 10, 2016) (5 pages) Paper No: JMNM-16-1023; doi: 10.1115/1.4034643 History: Received June 03, 2016; Revised August 30, 2016

Thermal fiber drawing has emerged as a novel process for the continuous manufacturing of semiconductor and polymer nanoparticles. Yet a scalable production of metal nanoparticles by thermal drawing is not reported due to the low viscosity and high surface tension of molten metals. Here, we present a generic method for the scalable nanomanufacturing of metal nanoparticles via thermal drawing based on droplet break-up emulsification of immiscible polymer/metal systems. We experimentally show the scalable manufacturing of metal Sn nanoparticles (<100 nm) in polyethersulfone (PES) fibers as a model system. The underlying mechanism for the particle formation is revealed, and a strategy for the particle diameter control is proposed. This process opens a new pathway for scalable manufacturing of metal nanoparticles from liquid state facilitated solely by the hydrodynamic forces, which may find exciting photonic, electrical, or energy applications.

Copyright © 2016 by ASME
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Fig. 1

Schematic of thermal fiber drawing process

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Fig. 2

Schematic of bundle-and-draw method for the iterative size reduction to achieve nanoparticles

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Fig. 3

SEM image of Sn microwires (3.4 ± 0.6 μm in diameter) after two iterations of drawing (cladding dissolved by solvent)

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Fig. 4

SEM image of nanoparticles obtained after four iterations of bundle-and-draw

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Fig. 5

Atomic resolution TEM image of a twinned β-Sn nanoparticle with polygonal shapes showing many facets as confirmed by their ring patterns (insets)

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Fig. 6

Perturbations in the forms of (a) centerline undulation, (b) modulation of radius along azimuthal angle, and (c) distortion of radius along centerline



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