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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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Scalable Syntheses of Graphene Oxide and Reduced Graphene Oxide using Cascade Design Oxidation and Highly Basic Reduction Reactions
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Graphene oxide film as solid lubricant.

Hongyu Liang1, Yongfeng Bu, Junyan Zhang

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.

ACS Applied Materials & Interfaces
|June 22, 2013
PubMed
Summary

Graphene oxide (GO) films significantly enhance the anti-wear performance of silicon microelectromechanical systems (MEMS). Electrophoretic deposition of GO films reduced friction by 6x and wear by 24x, showing promise for MEMS/NEMS applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Tribology

Background:

  • Silicon-based microelectromechanical systems (MEMS) face challenges with friction and wear.
  • Graphene oxide (GO) is a layered material with potential for improving surface performance.
  • Developing effective solid lubricants for MEMS/NEMS is crucial for device longevity.

Purpose of the Study:

  • To fabricate nanoscale graphene oxide (GO) films on silicon wafers using a green electrophoretic deposition (EPD) method.
  • To investigate the tribological properties (friction and wear) of GO-coated silicon wafers.
  • To evaluate the potential of GO films as solid lubricants for silicon-based MEMS/NEMS devices.

Main Methods:

  • Fabrication of tunable-thickness GO films on silicon wafers via green electrophoretic deposition (EPD) in an aqueous solution.
  • Characterization of GO film morphology, microstructure, and mechanical properties.
  • Evaluation of friction coefficient and wear resistance using tribological testing.

Main Results:

  • GO films were successfully fabricated with controllable nanoscale thickness on silicon wafers.
  • The friction coefficient of the silicon wafer was reduced by a factor of 6 when coated with GO film.
  • Wear volume was significantly reduced by a factor of 24, demonstrating excellent wear resistance.

Conclusions:

  • Graphene oxide (GO) films fabricated by EPD exhibit excellent solid lubricant properties for silicon surfaces.
  • The substantial reduction in friction and wear highlights the potential of GO films for silicon-based MEMS/NEMS.
  • GO films are a promising solution for enhancing the durability and performance of micro- and nano-electromechanical systems.