Graphene transistors operating at room temperature require operating conditions of less than 10 nanometers in size, which means that graphene nanostructures need to meet the width requirements of only a dozen atoms; these transistors require atomic-level precision electrical contacts. Scientists from the Netherlands have successfully demonstrated how to achieve this process. The study was published in the journal Nature Communications.
To solve the above problems, the staff used a single chemical bond to create electrical contacts on the graphene nanoribbons.
"For atomic-scale experimental requirements, it is clear that it is impossible to experiment with alligator clips. To exploit the potential of graphene nanoribbons in the future of electronics, it is necessary to use well-defined chemical bonds," said experiment presenter Peter Liljeroth.
The experiments used atomic force microscopy (AFM) and scanning tunneling microscopy (STM) to map graphene nanoribbons using atomic resolution. Utilizing the voltage pulse at the tip of the STM on the graphene nanoribbon—accurately, a single bond is formed at a specific atomic position. The pulse removes a hydrogen atom from the end of the graphene nanoribbon and then begins to promote bond formation.
Dr. Ingmar Swart of Utrecht University, who is also the project's project leader, said, "In combination with AFM and STM, we are able to describe graphene nanoribbons atom by atom; this is an understanding of nanoribbon structures, the keys and electricity of charged contacts. The correlation between performance is critical."
The research team combined with microscopy experiments and theoretical simulations to draw detailed contact nanoribbon performance maps. The most striking finding is that a single chemical bond forms a transparent electrical contact on the graphene nanoribbon, and the contact does not Affect the overall electronic structure of the nanobelt. This may be a critical step in the future application of graphene nanostructures.
Dr. Ari Harju of the University of Aalto said that these atomic-accuracy structural experiments allowed them to quantify theory and practice, thus gaining more research opportunities for the study of new graphene theory. (Compiled from Science Daily)
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