Electrodeposition of graphene layer from doped graphite
View Patent ↗Provided is a method of forming a uniform graphene layer on a substrate (metal- or conductive-polymer-coated, ITO) by doping expanded graphite using various kinds of dopants (Lewis acid) to grant a positive charge thereto, dispersing the doped expanded graphite in an organic solvent using ultrasonic waves to obtain a solution in which the graphene is dispersed in the organic solvent, and electrically applying a negative voltage to the solution.
1. A method of electrodepositing graphene, comprising:
doping expanded graphite using a dopant;
dispersing the doped expanded graphite in an organic solvent, and obtaining doped graphene dispersed in the solvent; and
applying a voltage between a counter electrode and a working electrode placed within the solvent in which the doped graphene is dispersed such that a graphene coating is formed at a surface of the working electrode.
2. The method of claim 1 , wherein the dopant is one of HNO 3 , FeCl 3 , H 2 SO 4 , and FTS.
3. The method of claim 1 , wherein the dopant is FeCl 3 .
4. The method of claim 3 , wherein the applied voltage is a negative voltage of −1.5 V to −1.0 V.
5. The method of claim 1 , wherein the solvent is ACN.
6. The method of claim 1 , wherein the dispersing is performed using an ultrasonic wave device.
7. The method of claim 1 , wherein the electrodeposition is performed using a platinum plate as the counter electrode, PEDOT-coated gold as the working electrode, and Ag/AgCl/KCI(sat'd) as a reference electrode.
8. The method of claim 1 , wherein the dopant is FeCl 3 , and the applied voltage is a negative voltage of −1.01 V.
9. A method of electrodepositing graphene, comprising:
p-doping expanded graphite using a dopant;
dispersing the doped expanded graphite in an organic solvent using ultrasonic waves, and obtaining doped graphene dispersed in the solvent;
and applying a negative voltage between a counter electrode and a working electrode placed within the solvent in which the doped graphene is dispersed such that a graphene coating is formed at a surface of the working electrode.
10. The method of claim 9 , wherein the dopant is one of HNO 3 , FeCl 3 , H 2 SO 4 , and FTS.
11. The method of claim 10 , wherein the dopant is FeCl 3 , and the negative voltage is −0.5 V or lower.
12. The method of claim 10 , wherein the dopant is FeCl3, and the negative voltage is −1.5 V to −1.0 V.