At the moment, GOgraphene sells graphene oxide as both aqueous dispersions and freeze dried powders. The powders were added to the product range to allow researchers to use GOgraphene's graphene oxide in non-aqueous systems (watch a video of our Graphene Oxide dispersions dispersing in water). “Non-aqueous” clearly covers a large number of media and the GOgraphene team wanted to learn more about which solvents their graphene oxide powder would disperse in.
From experience the GOgraphene team know how easily their graphene oxide powder disperses in water and based on available literature they knew that graphene oxide should disperse well in many polar solvents. To find out if GOgraphene's graphene oxide powder disperses as well in other polar solvents as it does in water, the team decided to put it to the test.
Using water, dimethylformamide (DMF), isopropyl alcohol (IPA) and ethylene glycol, 0.5 mg/mL graphene oxide dispersions were prepared using GOgraphene's freeze dried graphene oxide powder. The dispersions were left in an ultrasonic bath for 3 hours at ambient temperature and the results are shown in the picture above. The freeze dried powder dispersed well in all 4 solvents - another success for the GOgraphene team!
The Graphene Council is the world’s largest community for graphene professionals. Bringing together experts from around the world, conducting market surveys and working to influence industry standards for graphene, The Graphene Council is working hard to support the commercialisation of graphene based products.
AFM (atomic force microscopy) analysis has now been completed on GOgraphene graphene oxide. The AFM analysis was carried out to investigate both the lateral sheet dimensions and sheet depth, with the intention of discovering how many layers GOgraphene graphene oxide flakes are.
Diluting a sample of our 10 mg/mL aqueous graphene oxide dispersion down to a 1 ppm dispersion, it has been possible to measure the graphene oxide sheet sizes. The high dilution allows the AFM to measure fully dispersed material, without the individual flakes overlapping and consequently leading to more accurate dimensions for fully dispersed sheets.
The lateral dimensions of the plates varied, with the majority of flakes consistently over 5 microns in at least one lateral dimension. This corresponds very well with the SEM images obtained previously which showed lateral dimensions of over 5 microns. While there is currently no industry standard for understanding what the optimal graphene oxide sheet size is, GOgraphene graphene oxide is manufacturing a consistent quality product.
The AFM analysis is of particular interest for understanding the sheet depth. Single layers of graphene oxide are just over 1 nm tall, with greater depths informing the analyst approximately how many layers are stacked on top of one another. A few sheets stacked on top of one another can indicate that the graphene oxide is not fully dispersed into monolayers or that the graphite was not completely oxidised to enable all single layers to form. The AFM analysis on GOgraphene graphene oxide has shown a sheet depth of around 2 nm, proving that the individual flakes are only two graphene oxide sheets tall.
This is an exciting new piece of data for the GOgraphene range which really proves the 2 dimensional nature of graphene oxide. Data collection on our graphene oxide will continue over the coming months, however if there is analysis on our products which isn’t listed on our site yet and you feel it would benefit your research, please get in touch via our enquiry form and we will look into this.
Did you know GOgraphene, the William Blythe webshop dedicated to sales of graphene oxide has now been open for a month?
Graphene oxide is an exciting two dimensional material with a multitude of applications including its use as a graphene precursor. Global research in graphene oxide has boomed since the discovery of graphene oxide about a decade ago, with commercial applications just starting to take shape.
As an advanced materials manufacturer, William Blythe was eager to get involved with a 2 dimensional material which some predict will revolutionise products from electronics to engineering polymers. Within the first 6 months of product development William Blythe had a scalable and repeatable synthesis route which has since been refined and optimised into the method we use today.
Understanding that the majority of people currently interested in graphene oxide are researchers across a wide range of fields, William Blythe decided to focus on a graphene oxide range which is of maximum advantage for researchers in all applications. This led to the high concentration dispersions and freeze dried powders offered in the GOgraphene range, both developed to offer the best dispersions with the minimum sonication.
William Blythe has the capability to scale up the manufacture of graphene oxide to tonnage quantities and the Business Managers are handling all large volume sales, alongside the rest of the William Blythe product portfolio. The GOgraphene webshop was launched last month to enable the researchers William Blythe developed their graphene oxide for to buy at the quantities and prices suitable to their work, and already proving to be a popular destination even within the first few weeks of launching.
To find out more, or if you have any questions about the GOgraphene range please don’t hesitate to get in touch via our enquiry form.