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Updated: Jun 13, 2026

Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Synthesis of Homogeneously {100}-Textured 3-Inch Free-Standing Diamond Wafer.

Jing Zhang1,2, Stephan Handschuh-Wang3, Zhicheng Xing3

  • 1School of Integrated Circuits, Shenzhen Polytechnic University, Shenzhen 518055, China.

Materials (Basel, Switzerland)
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

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A novel two-step microwave plasma enhanced chemical vapor deposition (MPCVD) process yields large, {100}-textured free-standing diamond wafers. This method significantly enhances thermal conductivity for advanced material applications.

Area of Science:

  • Materials Science
  • Crystallography
  • Chemical Engineering

Background:

  • Fabricating large-area, single-crystal diamond wafers with specific crystallographic orientations is challenging.
  • Controlling crystal growth to achieve desired textures, like {100}, is crucial for optimizing diamond properties.

Purpose of the Study:

  • To develop a scalable method for producing {100}-textured free-standing diamond wafers.
  • To investigate the impact of a two-step growth process on diamond texture, crystal size, and thermal conductivity.

Main Methods:

  • Utilized microwave plasma enhanced chemical vapor deposition (MPCVD) with a two-step growth strategy.
  • Manipulated the growth parameter α (ratio of {100} to {111} growth rates) by controlling nitrogen addition.
  • Characterized the diamond wafer using optical microscopy, Raman spectroscopy, and X-ray diffraction (XRD).
Keywords:
MPCVDdiamondlarge areanitrogen addition{100}-textured microcrystalline diamond

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Last Updated: Jun 13, 2026

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Main Results:

  • Successfully fabricated a 3-inch, homogeneously {100}-textured free-standing diamond wafer (175 cm² area, ≥0.8 mm thickness) in 196 hours.
  • Achieved a diamond growth rate of 4.0-5.5 µm/h, four times higher than conventional methods.
  • Increased in-plane thermal conductivity from ~850 W/(mK) to 1125 W/(mK) due to homogeneous {100} texture and large crystal size (210 ± 60 µm).

Conclusions:

  • The developed two-step MPCVD process is effective for producing large-area {100}-textured diamond wafers.
  • The enhanced thermal conductivity demonstrates the potential of these wafers for high-performance thermal management applications.
  • The growth strategy allows for precise control over diamond texture and crystal morphology.