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Filtration-guided assembly for patterning one-dimensional nanostructures.

Yaozhong Zhang1, Chuan Wang2, Junghoon Yeom1

  • 1Department of Mechanical Engineering, Michigan State University, East Lansing, MI 48824, United States of America.

Nanotechnology
|March 11, 2017
PubMed
Summary

Filtration-guided assembly (FGA) offers a scalable and eco-friendly method for precisely arranging one-dimensional nanostructures (1D NSs). This technique enables efficient nanomaterial utilization and the creation of functional devices, overcoming previous assembly challenges.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Device Fabrication

Background:

  • Significant advancements in synthesizing one-dimensional nanostructures (1D NSs) like nanotubes and nanowires exist.
  • Challenges persist in the deterministic assembly of solution-processed 1D NSs for effective device integration.

Purpose of the Study:

  • To introduce and investigate a scalable, cost-effective nanomaterial assembly method: filtration-guided assembly (FGA).
  • To demonstrate FGA's capability for precise placement of 1D NSs, forming individual entities or ensembles for functional devices.
  • To highlight FGA's contribution to green nanomanufacturing by maximizing material use and minimizing waste.

Main Methods:

  • FGA employs selective filtration of 1D NSs through nanoporous membranes with patterned polymer masks.

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  • A modified soft-lithography technique, blanket transfer (BT), creates sub-10-micron resolution photoresist patterns on membranes.
  • Single-walled carbon nanotubes (SWCNTs) were used as a model system to demonstrate the method.

    • Main Results:

    • Fabrication of an array pattern of homogeneous 1D NS network films (SWCNTs) over a 20 cm² area in 10 minutes.
    • FGA-patterned SWCNT films exhibited highly uniform thickness and resistance after transfer to a substrate.
    • Demonstrated the electrical performance of back-gated transistors fabricated using the FGA and transfer method with 95% pure SWCNTs.

    Conclusions:

    • FGA provides a viable, scalable, and eco-friendly approach for the directed assembly of 1D nanostructures.
    • The method facilitates the creation of uniform nanostructure films suitable for electronic device applications.
    • This technique addresses key challenges in nanomanufacturing, paving the way for efficient device integration.