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Multiple-Patterning Nanosphere Lithography for Fabricating Periodic Three-Dimensional Hierarchical Nanostructures.

Xiaobin Xu1, Qing Yang1, Natcha Wattanatorn1

  • 1California NanoSystems Institute, ‡Department of Chemistry and Biochemistry, §Department of Pediatrics, David Geffen School of Medicine, ∥Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, ⊥Children's Discovery and Innovation Institute, and #Department of Materials Science and Engineering, University of California, Los Angeles , Los Angeles, California 90095, United States.

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Summary

Researchers developed multiple-patterning nanosphere lithography (MP-NSL) for scalable fabrication of 3D hierarchical nanostructures. This method precisely controls nanostructure dimensions for applications in electronics, biology, and optics.

Keywords:
3D lithographyhierarchical nanostructuremultiple patterningnanofabricationnanosphere lithographynanostructurenanotube

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Lithography

Background:

  • Scalable fabrication of 3D hierarchical nanostructures is challenging.
  • Existing methods lack precision and tunability for complex architectures.
  • Applications in electronics, biology, and optics demand advanced nanostructures.

Purpose of the Study:

  • To present a robust and general strategy for fabricating periodic 3D hierarchical nanostructures.
  • To demonstrate a scalable and tunable nanofabrication technique.
  • To enable precise control over nanostructure dimensions in three dimensions.

Main Methods:

  • Multiple-patterning nanosphere lithography (MP-NSL) using polymer nanospheres as resists.
  • Selected and repeated etching of nanospheres in parallel for each processing step.
  • Wafer-scale fabrication of periodic, vertically aligned silicon nanotubes.

Main Results:

  • Achieved nanometer-scale control over outer/inner diameters, heights/hole-depths, and pitches.
  • Fabricated 3D periodic hierarchical hybrid nanostructures, including multilevel nanotowers.
  • Constructed 3D concentric plasmonic nanodisk/nanorings with tunable optical properties.

Conclusions:

  • MP-NSL offers a highly scalable and tunable approach for complex 3D nanostructure fabrication.
  • The method allows precise configuration of dimensions for diverse nanostructure types.
  • MP-NSL is applicable to various substrates and enables tunable optical properties.