Invention Grant
- Patent Title: Pristine and functionalized graphene materials
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Application No.: US12508754Application Date: 2009-07-24
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Publication No.: US09991391B2Publication Date: 2018-06-05
- Inventor: Hongjie Dai , Xiaolin Li , Xiaoming Sun
- Applicant: Hongjie Dai , Xiaolin Li , Xiaoming Sun
- Applicant Address: US CA Stanford
- Assignee: The Board of Trustees of the Leland Stanford Junior University
- Current Assignee: The Board of Trustees of the Leland Stanford Junior University
- Current Assignee Address: US CA Stanford
- Agency: Bozicevic, Field & Francis LLP
- Agent Brian E. Davy
- Main IPC: B32B9/00
- IPC: B32B9/00 ; H01L29/786 ; B82Y30/00 ; B82Y40/00 ; H01L29/16 ; H01L29/778 ; C01B32/22 ; C01B32/225 ; C01B32/19

Abstract:
Disclosed are dispersed graphene sheets, ribbons, graphene molecules and the like which are pristine in the plane, i.e., free of significant defects and chemical modifications such as oxidation. The materials could be functionalized at the edges. These materials are dispersed in solutions rather than in aggregated or insoluble forms as their parent starting materials. Also disclosed is a method comprising the steps of intercalating an insoluble graphitic material. The method may comprise exfoliating graphite and re-intercalating the resultant material with an acid composition, such as oleum, and a strong organic base such as tetrabutylammonium hydroxide in a solvent solution to form a homogenous suspension, which is then agitated to form dispersed graphene materials. The materials may be solubilized with a hydrophilic polymer and can be further manipulated by transfer into different solvents, formation of films, application to optical and electronic devices, and other applications. The materials are solubilized by functional groups mostly at the edges.
Public/Granted literature
- US20100028681A1 Pristine and Functionalized Graphene Materials Public/Granted day:2010-02-04
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