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Related Concept Videos

Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Related Experiment Video

Updated: May 20, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

Diamond nanowire--a challenge from extremes.

Chih-Hsun Hsu1, Jimmy Xu

  • 1School of Engineering, Brown University, Providence, RI 02912, USA.

Nanoscale
|July 26, 2012
PubMed
Summary

Researchers grew crystalline diamond nanowires using chemical vapor deposition (CVD). These unique nanowires exhibit a core-shell structure, enabling novel electron field-emission properties.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Diamond nanowires are challenging to synthesize.
  • Understanding their formation mechanisms is crucial for applications.

Purpose of the Study:

  • To report the successful growth of crystalline diamond nanowires via chemical vapor deposition (CVD).
  • To investigate the structure, formation mechanism, and properties of these novel nanowires.

Main Methods:

  • Chemical Vapor Deposition (CVD) at 900 °C and atmospheric pressure.
  • Electron microscopy and Raman spectroscopy for structural characterization.

Main Results:

  • Achieved growth of straight, uniform diamond nanowires (60-90 nm diameter, tens of microns length).

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Atomically Traceable Nanostructure Fabrication
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Atomically Traceable Nanostructure Fabrication

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Last Updated: May 20, 2026

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  • Confirmed a core-shell structure: crystalline cubic diamond core within a graphitic shell.
  • Proposed a formation mechanism involving nano-capillary and surface charge pressure lowering Gibbs free energy.
  • Demonstrated impressive electron field-emission properties, comparable to nitrogen-vacancy single-photon emission.

    • Conclusions:

    • CVD enables the synthesis of unique diamond nanowires with a core-shell structure.
    • The proposed thermodynamic model explains the formation of diamond and graphitic phases.
    • Diamond nanowires offer promising potential for electron field-emission applications.