Showing all 6 results
Few Layer Graphene Oxide 2-4L$195.00 - $225.00 / per gram Select options
Graphene Oxide Gel$125.00 - $175.00 / per gram Select options
Reduced Graphene Oxide$400.00 - $450.00 / g Select options
Single Layer Graphene Oxide$195.00 - $225.00 / per gram Select options
Single Layer Graphene Oxide 1-20um$400.00 - $450.00 / per gram Select options
Single Layer Graphene Oxide 450nm$400.00 - $450.00 / per gram Quote or Add to Cart
Graphene Oxide Properties
Graphene Oxide’s properties are unique due to it’s high surface area, functionality and 2D sheet-like structure. It typically has >40% oxygen groups (including OH, COOH, & Epoxide groups) and is highly soluble in Di water, NMP, DMF, THF, Ethanol, and other polar solvents. GO can be reduced by a variety of methods to restore it’s 2D graphene structure.
GO isn’t conductive or strong due to the voids in its structure created during synthesis but can be reduced (called RGO) to restore it’s conductive and mechanical properties.
Graphene Oxide Synthesis
Originally called graphite oxide, GO’s synthesis methods have been known for decades. GO is synthesized by reacting graphite with strong oxidizers (potassium permanganate and sulphuric acid), rinsed and centrifuged repeatedly until the rinse water filtrate is PH neutral. It’s freeze dried to preserve solubility. The bulk product is a brownish/yellowish solid material that retains the layer structure of graphite but with a much larger and irregular spacing.
There are four common synthesis methods: Staudenmaier, Hofmann, Brodie and Hummers. Variations of these methods exist, including the Tour method (a modified hummers method) and synthesis is constantly being improved to provide a more consistent quality and cheaper processes.
The oxidation process is typically evaluated by the carbon/oxygen ratio, >40% is considered acceptable.
Graphene Oxide Applications
Applications include catalysis, drug delivery, solar, battery, tissue scaffolding and many other applications. It’s high solubility and ability to be reduce enable solution processing makes it a desirable material. This overcomes the well known dispersion problems associated with other nanomaterials such as carbon nanotubes, enabling improvements in materials science.
Graphene Oxide Structure
It’s 2D structure is shown above. The functional groups present impart GO with it’s legendary solubility compared to most nanomaterials. Surfactants aren’t needed when dispersing into polar solvents such as Di Water, NMP, DMF, THF, DCB, Ethanol, or others. Reducing GO removes the surface functionality and restores it’s conductive properties.
Graphene Oxide Chemical Formula
GO’s chemical formula and molecular weight are:
|Molecular Weight:||2043.856 g/mol|
Reduced Graphene Oxide
RGO is synthesized as GO and reduced afterwards. Reduction removes the surface functionality and restores the molecular structure to one closer to pristine graphene than GO.
Reduction is typically a chemical, thermal or electrochemical process. Other techniques are able to produce very high quality rGO, similar to pristine graphene, but can be complex or time consuming to carry out.
Graphene Oxide Reduction Methods Are:
Treating with hydrazine hydrate and maintaining the solution at 100c for 24 hours
Exposing to hydrogen plasma
Exposing to a strong pulse light (photo sintering), such as xenon or UV
Heating in distilled water at varying degrees for different lengths of time
Heating to very high levels in a furnace
Directly heating in a microwave
Heating to 400C in a forming gas atmosphere (95% argon, 5% hydrogen)
Chemical reduction is a highly scalable method however the surface area and electronic conductivity achieved isn’t high enough for many applications.
Heating GO to temperatures greater than 1000℃ creates RGO which has a very high surface area but the annealing process damages the structure when pressure builds up and carbon dioxide is released.
The reduction process can reduce it’s mass by ~ 30% and improves its electronic properties. Electrochemical reduction has been shown to produce very high quality RGO, almost identical in terms of structure to pristine graphene.
RGO can be selectively functionalized, enhancing its compatibility with the solvent/matrix or to create new compounds when combining RGO with other two dimensional materials. It’s surface chemistry can be tailored for compatibility with the application.
Graphene Oxide Price
Graphene Oxide price is determined by production volumes and degree of purification. Most of products are between $75-225/g but some variations cost $450/g.
Our products are washed and centrifuged 15 times until the filtrate is pH neutral. Then it’s freeze dried to preserve solubility and stored in a refrigerator.
This process costs more than processes used by companies that sell GO in solution with a low pH. The low pH is because they’ve reduced the washing and centrifuging cycles.
Difference Between Graphene & Graphene Oxide
First we must establish what is graphene or graphite. It is generally accepted that 2D sheets that are less than 10 layers thick can be called graphene. There are 3 main types of graphene: Graphene films which are typically made by CVD, ALD, or Epitaxial growth, Graphene Oxide which is exfoliated by reacting graphite in sulphuric acid with potassium permanganate in a highly exothermic reaction, & Graphene Nanoplatelets which can be plasma exfoliated or chemically exfoliated, ball milled, or thermally shocked and sheared to product stacks of graphene nanoplatelets.
So what’s the difference? It depends on your application. If you want electronic properties to make a sensor or device, we recommend CVD graphene, if you want good dispersion and solution processing, we recommend GO, if you want a mechanical reinforcing particle, we recommend graphene nanoplatelets.
Graphene Oxide Paper
GO Paper is relatively easy to make with vacuum or pressure filtration. GO’s known to disperse very easily due to the functional groups on its surface. To make GO paper, researchers typically disperse it in a solvent such as water or an organic solvent and then using a 0.2um membrane filter, they pour the solution through a filtration apparatus and the membrane keeps the particles on top while the solvent is collected below. When dry, the membrane can be removed leaving a free standing membrane paperlike product.
Graphene Oxide SDS
Please see our SDS at the link.
Graphene Oxide Dispersions
Dispersions are available from Cheap Tubes Inc. Please let us know your requirements such as solvent and loading ratio. Our standard concentration is 2mgs/ml but we can go up to 10mgs/ml.
Publications using GO from Cheap Tubes Inc
Below are some publications that used GO from Cheap Tubes Inc.
Elemental analysis typically shows a higher oxygen content than carbon content with small amounts of hydrogen.
We can provide dispersions In Di Water, NMP, THF, or DMF. Hazmat shipping fees may apply.
XPS data is for our SLGO 300-800nm product is below
Films and Coatings
GO and RGO coatings are available with the specifications below.
- SLGO or SLRGO film on glass/wafer (thickness 5-30 nm, area ~ 3-5 cm2, conductivity 10(4) – 10(5) Sm-1, sheet resistance 10(1)-10(3) Ω/sq)
- SLGO or SLRGO film on organic flexible substrate (thickness 5-30 nm, area ~ 3-5 cm2, conductivity 10(3) – 10(4) Sm-1, sheet resistance 10(2)-10(4) Ω/sq)
Showing all 6 results