On June 13, a study from Aalto University in the Netherlands stated that scientists have successfully demonstrated how to use a single chemical bond to establish electrical contacts on graphene nanoribbons. Graphene is a kind of honeycomb lattice-like monolayer material of carbon atoms. In recent years, scientists have been optimistic about its infinite prospects in the field of electronics.
Graphene transistors operating at room temperature require working conditions of less than 10 nanometers in size, which means that graphene nanostructures need to meet the width requirement of only a dozen atoms; these transistors require electrical contacts with atomic precision. Scientists from the Netherlands have successfully demonstrated how to achieve this process. The research was published in the journal Nature Communications.
In order to solve the above problems, the staff used a single chemical bond to establish electrical contacts on the graphene nanoribbons.
"For the experimental requirements at the atomic scale, it is clear that experiments cannot be carried out with alligator clips. To tap the potential of graphene nanoribbons in the field of electronics in the future, it is necessary to use well-defined chemical bonds," said experiment host Peter Liljeroth.
The experiment uses atomic force microscope (AFM) and scanning tunneling microscope (STM) to map graphene nanoribbons with atomic resolution. The voltage pulse at the tip of the STM is used to form a single bond at a specific atomic position on the graphene nanoribbons. 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 host of the study, said, "Combining AFM and STM, we can describe the graphene nanoribbons atom by atom; this is useful for understanding the structure of nanoribbons, the keys and the electrical properties of charged contacts The correlation between performance is critical. "
The research team combined a microscope experiment and theoretical simulation to draw a detailed performance map of the contact nanoribbons. The most notable discovery is that a single chemical bond forms a transparent electrical contact on the graphene nanoribbon, and the contact will not Affect the overall electronic structure of nanoribbons. This may be a critical step for the future application of graphene nanostructures.
Dr. Ari Harju of Aalto University said that these atomic precision structural experiments enable them to quantify the comparison between theory and practice, thus obtaining more research opportunities for the study of new graphene theory.
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