Researchers from Umeå have discovered a new method of synthesizing graphene oxide that has significantly fewer defects than materials produced by conventional methods. Likewise, good graphene oxide could previously only be synthesized using hazardous methods rather than highly toxic fuming nitric acid.

Graphene oxide is often used to make graphene by removing oxygen. However, if you have holes in the graphene oxide, you still have holes after converting to graphene. Therefore, the quality of graphene oxide is very important. Alexander Telzin and his research group at the University of Omio in Sweden have now cracked the puzzle of how to make good graphene oxide safely. Their findings were recently published in the journal Science. Carbon

Graphene is often described as a wonder material thanks to its flexibility, high mechanical strength and conductivity. But all the properties of graphene are affected by defects. Graphene produced from graphene oxide has poorer than expected mechanical properties and conductivity.

Many studies have shown that synthesis by the Hummers method, the most commonly used method, always leads to a significant number of defects. The very old Brody method provides almost completely hole-free graphene oxide, but this type of graphene oxide is still not produced by any company and is not commercially available.

“It’s very dangerous and not suitable for industrial manufacturing,” says Alexander Taliesin.

Now, researchers from Umeå have discovered a new method that combines an acid from the Hummers method (H2SO4) and an oxidant from the Brody method (potassium chlorate), allowing them to produce graphene oxide with many defects. are as small as in Brody. , but using a simple synthesis mechanism like humerus oxidation.

“The method should be named after Bartos Garzida, a Kempe stipendium-supported researcher in my group,” says Alexander Taliesin.

According to Alexander Taliesin, there is every reason to believe that the Grzeda method will become as popular as Hummers oxidation whenever defect-free graphene oxide is needed. This is to remove oxygen groups to form graphene or to prepare gas protection coatings, semi-permeable membranes, sensors and many other potential applications.

In the recent decade, there has also been considerable interest in the use of graphene oxide itself. Layered graphene oxide materials are intensively studied with the dream of producing potable water through simple filtration of salts from seawater that allows water to pass through while keeping out dangerous organic contaminants such as toluene.

“We want the research community to try and test this new graphene oxide in their own applications and see the difference. Graphene oxide is not one material; it’s a family of materials with different properties, which give us new Provides unlimited opportunities for applications.” Says Alexander Taliesin.