Graphene Oxide Sheets with Enhanced Visible Light Absorption and Electrical Conductivity

Technology #16306

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Compositions Comprising Enhanced Graphene Oxide Structures and Related Methods 1Compositions Comprising Enhanced Graphene Oxide Structures and Related Methods 2Compositions Comprising Enhanced Graphene Oxide Structures and Related Methods 3Compositions Comprising Enhanced Graphene Oxide Structures and Related Methods 4
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Inventors
Professor Angela Belcher
Department of Biological Engineering, MIT
External Link (belcherlab.mit.edu)
Professor Jeffrey Grossman
Department of Materials Science and Engineering, MIT
External Link (zeppola.mit.edu)
Neelkanth Bardhan
Department of Materials Science and Engineering, MIT
Priyank Kumar
Department of Materials Science and Engineering, MIT
Managed By
Christopher Noble
MIT Technology Licensing Officer - Clean and Renewable Energy
Patent Protection

Compositions Comprising Enhanced Graphene Oxide Structures and Related Methods

US Patent 9,527,741
Publications
Scalable Enhancement of Graphene Oxide Properties by Thermally Driven Phase Transformation
Nature Chemistry, Dec. 15, 2013, online

Applications

Graphene oxide sheets processed using this invention can be applied to a wide range of electronic and photonic devices such as computer chips, flexible electronics, photovoltaics, and batteries.

Problem Addressed

Current synthesis methods for graphene oxide sheets typically create structural disorder that result in large band gaps and low electrical conductivity.  This post-processing technology reduces the band gap and improves electrical conductivity, making the graphene oxide sheets more suitable for devices.

Technology

This technology improves the properties of graphene oxide sheets for device applications by annealing the sheets at low temperatures (less than 125 °C).  During annealing, distinct regions of oxidized and graphitic regions develop on the sheets as oxygen atoms diffuse through the graphene plane.  This does not reduce the oxygen content of the sheet but this phase separation drastically increases electrical conductivity (by up to 4 orders of magnitude) and reduces the band gap to improve the absorption of visible light.  The sheet's final properties can be adjusted by changing the annealing temperature and time so this technology can be adapted to a wide range of applications.

Advantages

  • Scalable for commercial manufacturing
  • Cheap and easy post-processing that is applicable to a wide range of applications
  • Preserves oxygen levels within the graphite oxide sheets