Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for preparing water-phase dispersible conductive graphene dispersion slurry or solid

A technology of conductive graphite and dispersion slurry, which is applied in the field of material preparation and biosensing, can solve complex and time-consuming problems, destroy graphene lattice, affect conductivity and other problems, and achieve the effect of improving core performance indicators and excellent electronic conductivity

Active Publication Date: 2017-06-06
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does improve its water phase dispersibility, but because the introduction of these groups destroys the graphene lattice, the electrical conductivity of graphene drops sharply by several orders of magnitude, making graphene change from an excellent conductor to for semiconductor
To restore the conductivity of graphene, graphene oxide must be reduced to graphene through complex chemical reduction or high-temperature quenching. This process is complex and time-consuming, and the reduced graphene will inevitably have some structural defects that affect the conductivity.
The method reported in the literature to functionalize graphene in a covalent manner to improve its dispersibility is due to the use of oxygen-containing groups on the surface of (oxidized) graphene. greatly affected

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing water-phase dispersible conductive graphene dispersion slurry or solid
  • A method for preparing water-phase dispersible conductive graphene dispersion slurry or solid
  • A method for preparing water-phase dispersible conductive graphene dispersion slurry or solid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1. Preparation of water phase dispersible conductive graphene

[0022] The graphene used for modification in the present invention can be commercialized graphene, and also can be graphene with high conductivity made by the laboratory. figure 1 In a shows the transmission electron microscope (TEM) image of pristine graphene. Due to the hydrophobic nature of the surface, graphene will still be deposited at the bottom of the water phase after adding graphene to deionized aqueous solution and vibrating or ultrasonicating for 15 minutes. Table 1 lists 12 representative ionic liquids for graphene modification. The cations are mainly concentrated in imidazoles, pyridines, and phosphines, and the anions include amino acids, tetrafluoroborate, methanesulfonate, hexafluoroborate, and hexafluoroborate. Fluorophosphate, triflate, bis(trifluoromethanesulfonyl)imide. The conductive graphene dispersion slurry with water phase dispersibility is preferably obtained in the f...

Embodiment 2

[0025] Example 2. Spectral characterization of water phase dispersible conductive graphene

[0026] Water-phase dispersible graphene modified with amino acid ionic liquids was first characterized by spectroscopic methods. figure 2 The FT-IR spectra of pristine graphene (GR), graphene oxide (GO), ionic liquid EMIMAla, and EMIMAla-functionalized graphene (GR-EMIMAla) are given. The GR-EMIMAla sample used for spectroscopic characterization contains 0.2 mg ml -1 Graphene and 0.25mg ml -1 A sample of the modified graphene dispersion of amino acid ionic liquid after drying. The above sample is obtained by the following method: firstly add 0.2mg graphene to 1ml containing 0.25mg ml -1 In the water of EMIMAla ionic liquid, complete dispersion by ultrasonic, stirring or shaking mode, obtain the graphene dispersion slurry that can be stably dispersed in the water phase system through ion liquid modification; Above-mentioned conductive graphene dispersion slurry with water phase disp...

Embodiment 3

[0027] Embodiment 3. Electrochemical impedance spectroscopy characterization of water phase dispersible conductive graphene

[0028] The electrical conductivity of aqueous dispersible graphene modified with amino acid ionic liquids was characterized by electrochemical impedance spectroscopy. The biggest advantage of the graphene dispersion method used in the present invention is that it does not destroy the structure of graphene and can maintain the inherent excellent electronic conductivity of graphene, which cannot be achieved by traditional covalent modification methods. In this study, the heterogeneous electron (charge) transfer resistance (Rct) of the modified material was investigated by electrochemical impedance spectroscopy, and Rct can directly reflect the conductive properties of the material. Electrochemical impedance spectroscopy is a very sensitive and commonly used tool for characterizing the speed of electron (charge) exchange between materials and their surroun...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
electrical resistivityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for preparing a conductive graphene dispersion slurry or a solid with a dispersible water phase. The dispersible graphene slurry or a solid material employs a non covalent method to prepare; the method comprises the following steps: adding a certain amount of an ionic liquid having a certain water solubility in deionized water for vibrating and uniform shaking, then weighing a certain amount of high conductivity graphene and adding in an aqueous solution of the ionic liquid for ultrasonography or vibrating dispersion, and then obtaining the conductive graphene dispersion slurry modified by ionic liquid; performing freeze drying under vacuum on the slurry or drying to remove moisture at temperature lower than 100 DEG C to obtain the conductive graphene dispersion solid with dispersible water phase. The graphene material has good dispersibility and solubility in a hydrophilic solvent. The preparation method and the conductive graphene with dispersity of aqueous phase can be widely used in the fields of chemical sensing, biosensing, energy storage, device, catalysis and analysis.

Description

technical field [0001] The invention belongs to the field of material preparation and biosensing, and relates to a preparation method of conductive graphene slurry and solid with water phase dispersion and the application of related materials and methods in the fields of sensors, energy storage and the like. Background technique [0002] Graphene (GR for short) is a two-dimensional material with a hexagonal honeycomb lattice composed of carbon atoms in sp2 hybridized orbitals and a thickness of only one carbon atom. Graphene is currently the thinnest but also the hardest nanomaterial in the world; its thermal conductivity is as high as 5300W / m·K, which is higher than that of carbon nanotubes and diamonds, and its resistivity is only about 10 at room temperature. -6 Ω·cm, lower than copper or silver, is the material with the smallest resistivity in the world. Since graphene is essentially a transparent and good conductor, it has a wide range of applications in devices (elect...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/194
Inventor 卢宪波王雪陈吉平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI