Method for preparing conductive single-layer graphite sheet modified by ionic liquid cation group

A single-layer graphite and ionic liquid technology, applied in the field of preparation of single-layer graphite sheets, can solve the problems of incompatibility of polymers and polymers, long time, environmental pollution, etc., and achieve good electrical conductivity, fast reaction speed, and environmental friendliness. Effect

Inactive Publication Date: 2008-07-09
NORTHEAST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the only known way to prepare single-layer graphite flakes is the oxide of exfoliated carbon, but the single-layer graphite flakes made of oxides of exfoliated carbon are due to the presence of hydroxyl and epoxy compounds on the flakes. In addition, carbonyl and carboxyl groups appear on the edge of the sheet, so there are many defects: first, it is hydrophilic, not lipophilic, so it cannot be miscible with polymers; second, it is insulating, so it is in the preparation of conductive composites. There are also many limitations in the application
However, it takes a long time to add chemical modifiers and reducing agents, and Stankovich et al. use a large amount of methanol in the process of coagulating the composite material, thus causing environmental pollution and waste of time

Method used

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  • Method for preparing conductive single-layer graphite sheet modified by ionic liquid cation group
  • Method for preparing conductive single-layer graphite sheet modified by ionic liquid cation group
  • Method for preparing conductive single-layer graphite sheet modified by ionic liquid cation group

Examples

Experimental program
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Effect test

Embodiment 1

[0014] Use 1-octyl-3 methylimidazolium hexafluorophosphate and water with a volume ratio of 1:1 as the electrolyte, graphite rods as electrodes, and a constant voltage and current power supply to provide a voltage of 15 volts for 10 hours of electrolysis. After the reaction is completed, the The exfoliated single-layer graphite flake obtained was washed with absolute ethanol, and dried in a drying oven at 55° C. for 6 hours to obtain a conductive single-layer graphite flake modified with 1-octyl-3 methylimidazole ;

Embodiment 2

[0016] Use 1-octyl-3-methylimidazolium tetrafluoroborate and water with a volume ratio of 1:1 as the electrolyte, graphite rods as electrodes, and a constant-voltage and stable-current power supply to provide 15 volts for 8 hours of electrolysis. After the reaction is complete Wash the exfoliated single-layer graphite sheets obtained with absolute ethanol, and dry them in a drying oven at 55° C. for 6 hours to obtain a conductive single-layer graphite modified with 1-octyl-3 methylimidazole piece;

Embodiment 3

[0018] Use 1-octyl-3 methylimidazole chloride and water with a volume ratio of 1:5 as the electrolyte, graphite rods as electrodes, and a constant voltage and current power supply to provide a voltage of 10 volts for 6 hours of electrolysis. After the reaction is completed, the obtained The exfoliated single-layer graphite sheet was washed with absolute ethanol, and dried in a drying oven at 55°C for 6 hours to obtain a conductive single-layer graphite sheet modified with 1-octyl-3 methylimidazole;

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Abstract

The invention provides a process for preparing a single layer graphite flake with electrical conductivity and modification of ionic liquid cationic groups. Ionic liquid and water are used as electrolytic solution, a graphite rod is used as electrodes, cationic organic groups of the ionic liquid in reaction can be connected to graphite flakes and cause exfoliation of the graphite, obtained single layer graphite flakes have organic groups and are not oxygenized, thereby having good oil solubility to be mutually-soluble with the high molecular polymer, good electrical conductivity and the single layer graphite flakes can be used for preparing conductive composite materials with good performance.

Description

technical field [0001] The invention relates to a preparation method of a self-conducting single-layer graphite sheet modified with an ionic liquid cationic group, which does not require reduction. Background technique [0002] Carbon-based composite materials are being widely concerned by scientists due to their light weight, high strength, and good electronic conductivity. For example, they can be used in aerospace and military fields. (Kotov, A.N.Carbon sheet solutions. Nature 442, 254-255(2006).) At present, carbon-based composite materials are mostly filled with single-walled carbon nanotubes, but single-walled carbon nanotubes are easy to agglomerate; Nanotubes formed by curling sheets have limitations such as difficulty in controlling their diameter and high cost. (Price, B.K.Hudson, J.L.Tour, J.M.Green Chemical Functionalization of Single-Walled Carbon Nanotubes in Ionic Liquids.J.Am.Chem.Soc.127, 14867-14870(2005).) Due to the above reasons, scientists will view I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/04
Inventor 罗芳刘娜
Owner NORTHEAST NORMAL UNIVERSITY
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