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Related Experiment Video

Updated: Feb 17, 2026

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Subnanometer structure and function from ion beams through complex fluidics to fluorescent particles.

Kuo-Tang Liao1, Joshua Schumacher, Henri J Lezec

  • 1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. samuel.stavis@nist.gov.

Lab on a Chip
|November 30, 2017
PubMed
Summary
This summary is machine-generated.

This study reveals subnanometer fabrication limits for complex nanostructures using ion beam patterning. It demonstrates precise nanofluidic device fabrication for nanoparticle separation and tracking, uncovering new structure-function relationships.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Analytical Chemistry

Background:

  • Vertical dimensions of nanostructures are critical for nanotechnology functions.
  • Subnanometer scale structure-function relationships remain largely unexplored.

Purpose of the Study:

  • Investigate the limits of structure-function relationships at subnanometer scales.
  • Quantify measurement uncertainty in nanofabrication and characterization.
  • Apply precise dimensional control to fabricate functional nanofluidic devices.

Main Methods:

  • Focused ion beam (FIB) fabrication for subtractive patterning of silicon-based materials.
  • Quantitative evaluation of measurement uncertainty from atomic force microscopy (AFM).
  • Optical microscopy for nanoparticle characterization and tracking within nanofluidic devices.

Main Results:

  • Demonstrated subnanometer resolution in fabricating complex topographies on hard materials.
  • Successfully fabricated nanofluidic devices for size exclusion separation of nanoparticles.
  • Established subnanometer limits for fluidic manipulation and critical-dimension particle tracking.
  • Discovered a supervolumetric relationship between nanoparticle size and fluorescent emission intensity.

Conclusions:

  • Standard FIB systems offer underutilized capabilities for rapid prototyping of subnanometer structures.
  • Precise nanofabrication enables advanced analytical applications like nanoparticle separation and tracking.
  • An unexpected size-dependent fluorescence behavior in nanoparticles was observed and modeled.