The Research Of Oxidation-reduction Method For Graphene

Graphene is a kind of only a single atomic layer thickness of the graphite flake.It has a lot of features. Although it’s very thin, it’s strong too. Its mechanicalperformance is very good. In addition, it also has good electrical conductivity. Theseexcellent performance make graphene materials have a great potential application inmany fields. But the biggest problem is that it can’t be mass produced. It is still in thestage of laboratory research. At present, there are many kinds of preparation methodsof graphene, but many methods of preparation of graphene is imperfect, and thegraphene that produced by these methods has varying degrees of faults. Adopt whatkind of effective method to produce more perfect graphene is very important in thefuture basic theory research, and it also has a profound influence on its wideapplication in the future.I decide to use oxidation-reduction method to produce graphene by readingliterature. And I choose the hydrazine hydrate and hydrogen as reductant in thereduction process. I use the hydrazine hydrate as a comparison. Using high puritygraphite powder as raw material, and preparing graphite oxide by using Hummersmethod. Then using hydrazine hydrate and hydrogen as the reductant to get graphene.I have used SEM, XRD, Infrared spectra analysis and Raman spectrum analysis toanalyze the graphene. By using SEM to observe the surface morphology of thegraphene, I knew that the graphene prepared by the oxidation-reduction that usinghydrogen as the reductant has less layers than the graphene prepared by theoxidation-reduction that using hydrazine hydrate as the reductant. Through XRD, Ialso knew that the graphene prepared by the oxidation-reduction that usinghydrogen as the reductant has less layers. What’s more, I knew that the oxygencontaining functional groups in the graphene that prepared by the oxidation-reductionthat using hydrogen as the reductant is less. It means the graphene that prepared bythe oxidation-reduction that using hydrogen as the reductant is better on many aspects.And the result that analyzed by the Infrared spectra is the same as the result of XRD.And then use the confocal micro Raman spectrometer to analyze the structure of graphene. Then calculate the ID/IGratio of the graphene that restored by hydrogen andthe graphene that restored by hydrazine hydrate. The ID/IGratio of the graphene thatrestored by hydrogen is0.87, and the ID/IGratio of the graphene that restored byhydrazine hydrate is1.50. It means that the graphene that restored by hydrogen isbetter than the graphene that restored by hydrazine hydrate. So, in terms of reductioneffect, hydrogen is more suitable than hydrazine hydrate as the reductant in theprocess of oxidation-reduction method to prepare graphene. What’s more, hydrazinehydrate is toxic to human’s body and harmful to human’s health. It’s belongs to thedangerous things. In addition, hydrazine hydrate will pollute the environment. On thecontrary, as we all know, hydrogen is a kind of green energy, nonpoisonous andharmless. The hydrogen reacts with oxygen to produce water. It won’t pollute theenvironment.So no matter we consider from the effect of reducing or security perspective,hydrogen is more suitable than hydrazine hydrate as a reductant in the process ofoxidation-reduction of graphene.