Researchers from Seoul National University developed a simple method to produce graphene nanonet (GNN) patterns on large areas. The patterns, which contain continuous networks of chemically functionalized graphene nanoribbons, could be used to make biosensor devices. These patterns behave better than GO or GNRs which are commonly used for biological sensing applications and are easy to make.
The GNN structures are made from continuous networks of GNRs with chemical functional groups on their edges. The chemical functional groups in the GNN can be functionalized with biological molecules such as DNA for biochip applications. The researchers successfully performed fluorescence imaging of DNA molecules on the GNN channels and has electrically detected the DNA at 1 nM concentrations using the GNN-based biochip devices.
The new process uses selectively assembled V2O5 nanowires as a shadow mask on a graphene layer during a reactive ion etching step.