Graphene oxide was synthesized by Hummers method through oxidation of graphite. The stepwise preparation is given as follows: 1. Graphite flakes (2 g) and NaNO3 (2 g) were mixed in 50 mL of H2SO4 (98%) in a 1000 mL volumetric flask kept under at ice bath (0-5°C) with continuous stirring.
How is graphene oxide synthesized?
Graphene oxide is effectively a by-product of this oxidisation as when the oxidising agents react with graphite, the interplanar spacing between the layers of graphite is increased. The completely oxidised compound can then be dispersed in a base solution such as water, and graphene oxide is then produced.
How do you make graphene oxide solution?
From graphene oxide powder you can get graphene oxide solution by dissolving an appropriate amount of the powder into water and then using ultrasonic probe for 1 hr. You have to put your solution in ice path during the sonication. If you are using 700 watt sonicator, it is enough to adjust the power to 40%.
How do you synthesize reduced graphene oxide?
Synthesis of Reduced Graphene Oxide (RGO) The RGO was prepared by dispersing 400 mg XGO into 800 mL of distilled water while stirring and heating at 95°C for 4 days.
How do you oxidize graphene?
The oxidized graphene (OG) was obtained by oxidizing the graphene via a simplified Hummer’s method, which begins by mixing 1 g of graphene, 30 ml of H2SO4 (98%) and 10 ml of HNO3 (98%) in a 1000 ml volumetric flask that was stirred continuously for 2 h.
How do you synthesis graphene?
Graphene can synthesis by arc discharge method in the presence of H2 atmosphere with two to three layers having flake size of 100–200 nm [180, 184]. By rapid heating process Arc discharge in an air atmosphere resulted in graphene nano sheets that are ~100–200 nm wide predominantly with two layers [182].
How do you convert graphene oxide to graphene?
Chemically converted graphene has been synthesized via the reduction of graphene oxide by using organic bases, including 1,8-diazoicyclo (5, 4, 0) undecene-7, triethylamine and 1,4-diazobicyclo (2, 2, 2) octane, as the reducing agent.
Why graphene is used in nanotechnology?
Since graphene is just a single layer of carbon atoms connected in a hexagonal pattern, it is also extremely thin and lightweight, and therefore an attractive material for nanotechnology applications.
How do you make graphite?
They are made from petroleum coke after it is mixed with coal tar pitch. They are then extruded and shaped, then baked to carbonize the binder (pitch), and finally graphitized by heating it to temperatures approaching 3000 °C, at which the carbon atoms arrange into graphite.
What are the 3 methods used to produce rGO powders?
The preparation process of reduced graphene oxide (rGO) consists of three steps: oxidation or intercalation, exfoliation, and reduction.
What is reduced graphene oxide?
Reduced graphene oxide (RGO) is the form of GO that is processed by chemical, thermal and other methods in order to reduce the oxygen content, while graphite oxide is a material produced by oxidation of graphite which leads to increased interlayer spacing and functionalization of the basal planes of graphite.
How can you tell the difference between rGO and go?
Xiao Fan The only big difference between GO and rGO is the number of oxygen molecules present, hence conductivity. GO in an insulator, while rGO is electrically conductive, but also the conductivity depends on the degree of reduction. Highly reduced rGO is almost a superconductor, just like pure graphene.
Which is responsible for high mechanical property of graphene?
The reason for the exceptional mechanical properties of graphene lies in the stability of the sp2 bonds that form the hexagonal lattice and oppose a variety of in-plane deformations.
Can graphene be oxidised?
Graphene oxide is an oxidized form of graphene, laced with oxygen-containing groups. It is considered easy to process since it is dispersible in water (and other solvents), and it can even be used to make graphene.
What is graphene oxide made of?
The graphene oxide molecular structure consists of carbon, hydrogen and oxygen. One of the most important traits of GO is that it can be produced using graphite (since it is inexpensive) using different chemical methods, yielding a high production with exceptional cost-efficiency.
What is graphene oxide?
Graphene oxide (GO), an oxidized derivative of graphene, is currently used in biotechnology and medicine for cancer treatment, drug delivery, and cellular imaging. Also, GO is characterized by various physicochemical properties, including nanoscale size, high surface area, and electrical charge.
How do you extract graphene from graphite?
First, pour some graphite powder into a blender. Add water and dishwashing liquid, and mix at high speed. Congratulations, you just made the wonder material graphene. This surprisingly simple recipe is now the easiest way to mass-produce pure graphene – sheets of carbon just one atom thick.
How does graphite synthesize graphene?
The most common use to produce graphene is chemical method (Hummers method). This method basically uses graphite as starting material. The graphite is oxidized by treatment with KMnO4 and NaNO3 in concetrated H2SO4 and further being reduced using reducing agent to form graphene [12].
Is graphene difficult to produce?
For all its high-tech capacities, graphene is surprisingly easy to make at home—in very small quantities. The only raw materials needed are graphite (for instance, the broken-off point of a standard Number 2 pencil) and some fairly robust adhesive tape.
Can graphene oxide be made clear?
We compare the water contact angle for graphene and graphene oxide coatings, both prepared on iridium(111) surfaces. The results show both materials to be transparent to wetting, but indicate a lower freezing onset temperature for graphene oxide than for pristine graphene.
What is the chemical formula of graphene?
Graphene oxide, powder, 15-20 sheets, 4-10% edge-oxidized
| PubChem CID | 124202900 |
|---|---|
| Structure | Find Similar Structures |
| Molecular Formula | C140H42O20 |
| Synonyms | Graphene oxide, powder, 15-20 sheets, 4-10% edge-oxidized Graphene oxide, 15-20 sheets, 4-10% edge-oxidized, 1 mg/mL, dispersion in H2O |
| Molecular Weight | 2043.8 |
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