Researchers have demonstrated that graphene can be used as a building block to create new 3D crystal structures which are not confined by what nature can produce.
Sandwiching individual graphene sheets between insulating layers in order to produce electrical devices with unique new properties, the method could open up a new dimension of physics research.
The scientists show that a new side-view imaging technique can be used to visualize the individual atomic layers of graphene within the devices they have built. They found that the structures were almost perfect even when more than 10 different layers were used to build the stack. This surprising result indicates that the latest techniques of isolating graphene could be a huge leap forward for engineering at the atomic level.
This development gives more weight to graphene’s suitability as a major component in the next generation of computer chips.
The researchers’ side-view imaging approach works by first extracting a thin slice from the centre of the device. This is similar to cutting through a rock to reveal the geological layers or slicing into a chocolate gateaux to reveal the individual layers of icing. The scientists used a beam of ions to cut into the surface of the graphene and dig a trench on either side of the section they wanted to isolate. They then removed a thin slice of the device.
One of the researchers remarks that they “have found that the observed roughness of the graphene is correlated with their conductivity. Of course we have to make all our electrical measurements before cutting into the device. We were also able to observe that the layers were perfectly clean and that any debris left over from production segregated into isolated pockets and so did not affect device performance. We plan to use this new side view imaging approach to improve the performance of our graphene devices.”
This story is reprinted from material from The University of Manchester, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.