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Beams are integral components of structural engineering and construction, designed to support loads applied at various points along their length. These long, straight members can be classified based on geometry, cross-section, support type, and equilibrium condition.
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Principal Stresses in a Beam01:11

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Deterministic Nanopatterning of Diamond Using Electron Beams.

James Bishop1, Marco Fronzi1,2, Christopher Elbadawi1

  • 1School of Mathematical and Physical Sciences , University of Technology, Sydney , P.O. Box 123, Broadway, Sydney , New South Wales 2007 , Australia.

ACS Nano
|January 25, 2018
PubMed
Summary

Electron beam-induced etching (EBIE) uses oxygen and hydrogen to precisely pattern diamond. Hydrogen addition enables anisotropic etching, allowing control over nanoscale surface topography for advanced material applications.

Keywords:
anisotropychemical rate kineticsdiamonddirected lithographyelectron beam-induced etchingnanofabricationpatterning

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Diamond's unique properties make it ideal for advanced applications.
  • Traditional diamond processing is difficult due to its hardness and chemical inertness.
  • Gas-mediated electron beam-induced etching (EBIE) offers a novel nanoscale patterning method.

Purpose of the Study:

  • To elucidate the roles of oxygen and hydrogen in EBIE of diamond.
  • To understand the mechanisms behind anisotropic etching in diamond.
  • To demonstrate control over nanoscale surface topography using EBIE.

Main Methods:

  • Utilized gas-mediated electron beam-induced etching (EBIE) with oxygen and hydrogen.
  • Analyzed etch reaction pathways and surface morphology.
  • Investigated the effect of hydrogen partial pressure and plasma radicalization on anisotropy.

Main Results:

  • Oxygen promotes rapid, isotropic etching of diamond.
  • Hydrogen addition induces anisotropic etching and topographic pattern formation.
  • Anisotropy is attributed to preferential passivation of specific diamond crystal planes.
  • Controlled anisotropy by adjusting hydrogen partial pressure and using a remote RF plasma source.

Conclusions:

  • Provided a comprehensive explanation of anisotropic EBIE in diamond.
  • Established control over nanoscale and microscale structure geometries.
  • Advanced the understanding of electron-surface interactions in diamond processing.