After the graphene treatment of the radio frequency plasma cleaner, it is used in the fields of capacitor catalytic energy storage:
Graphene, a two-dimensional planar structural material composed of carbon atoms, has attracted extensive attention from domestic and foreign scientific researchers for its physical and chemical properties. Graphene-based materials have been widely used in capacitors, lithium batteries, micro/nano devices, sensors, organic optoelectronic devices, biomedicine, catalysis and other fields.
The chemical oxidation-reduction method is currently one of the widely used methods for preparing graphene, and it is also a method that is currently possible to achieve large-scale preparation. Generally, the method of reducing graphene oxide is to use some commonly used reducing agents, such as hydrazine hydrate, hydroquinone, strong alkali, hydroiodic acid, etc. Most of these reducing agents are toxic or corrosive and will pollute the environment. The use of physical methods to reduce graphene oxide will not affect the environment and is an environmentally friendly method.

The radio frequency plasma cleaning machine processing method, namely radio frequency plasma, processes the graphene oxide, and rapidly reduces the graphene oxide in one step to prepare a three-dimensional porous graphene material. Through Raman spectroscopy, it can be confirmed that as the plasma power of the radio frequency plasma cleaner increases, the degree of graphene oxide reduction gradually increases. The prepared three-dimensional porous graphene material is expected to be used in capacitors, catalysis, energy storage and other fields.
For the graphene oxide samples before plasma treatment and after vacuuming by the radio frequency plasma cleaner, with the decrease of the pressure, the boiling point of the graphene oxide aqueous solution decreases, and accompanied by boiling phenomenon, due to the decrease of the internal energy of the solution, the subsequent samples quickly (< 1s) It freezes and becomes solid, and the color is yellow-brown; the color of the sample after hydrogen or argon plasma treatment is black-brown.
This phenomenon indicates that the graphene oxide suspension changes from liquid to solid after being treated with hydrogen or argon plasma, and the color change indicates that the graphene oxide is partially reduced. After hydrogen and argon plasma treatment, both low-magnification and high-magnification scanning electron microscopy of the sample can clearly observe the cross-linked, porous network structure.
During the plasma treatment process of the radio frequency plasma cleaner, the sample is always in a low pressure state, and the formed ice is directly sublimated into water vapor, thus maintaining the three-dimensional porous morphology of the sample. Raman spectroscopy was performed on the samples before and after the hydrogen and argon plasma treatment. Both hydrogen and argon plasma can reduce graphene oxide, and the reduction degree of graphene oxide by hydrogen (reducing gas) plasma is more obvious.
The reason why hydrogen and argon plasma can reduce graphene oxide is mainly because the energy of hydrogen or argon plasma can effectively cut off the oxygen-containing bonds on the surface and edge of the graphene oxide layer, making the graphene oxide oxygen-containing The functional groups are reduced and partially reduced. The graphene oxide solution is treated with the same gas plasma. The greater the plasma discharge power and the greater the energy, the greater the degree of reduction of graphene oxide.
The plasma method of the radio frequency plasma cleaner reduces the graphene oxide quickly and effectively in one step. By changing the type of discharge gas and discharge power, the Raman spectroscopy test shows that the stronger the reduction of the gas, the greater the discharge power, and the higher the degree of reduction of graphene oxide. The three-dimensional porous graphene material obtained after the reduction treatment by the radio frequency plasma method can be further applied to the fields of capacitors, energy storage and the like.