A team of Swiss scientists has developed a way of flattening corrugations in graphene layers, leading to an improved sample quality. Since graphene’s discovery, its sample quality has steadily improved, but the corrugations in the graphene sheet caused by microscopic distortions slow the movement of electrons when moving through an electronic device.
The scientists, from the Swiss Nanoscience Institute and the Department of Physics at the University of Basel, investigated these corrugations, and in flattening them, found that electrons moved more efficiently through a graphene sheet. The team developed a technique where the graphene sheet is pulled from opposite sides, which smoothed out the distortions and improved the speed electrons moved through the material. The study’s first author, Dr. Lujun Wang, likened the process they used to “pulling a piece of paper that irons out wrinkles and folds.”
According to Phys.org, the newly discovered technique has not only improved the sample quality of the graphene sheet, but has implications for how other two-dimensional materials will be studied. The team’s findings were recently published in Physical Review Letters.