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New graphene-based device is the first step towards ultra-sensitive biosensors



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In this new study, university researchers in the United States combined with the nano-size graphite gold metal strip. Using adhesive tape and a high-tech nanofabrication technology developed at the University of Minnesota, called "template stripping", researchers were able to create an ultra-light base layer for the graph.

They then used the energy of light to generate a sloshing motion of electrons in the graph, called plasmon, which can be considered as ripples or waves spreading through an "ocean" of electrons. Similarly, these waves can build in intensity against giant "tidal waves" of local electric fields based on the researchers' rapid design.

By illuminating light on the monoatomic graphene layer device, they were able to create a plasmon wave with unprecedented efficiency at an almost perfect 94% light field absorption in "tidal waves" of electric field. When they introduced protein molecules between the graph and the metal bands, they could utilize enough energy to see individual layers of protein molecules.

"Our computer simulations showed that this new method would work, but we were still a little surprised when we achieved 94 percent light absorption in real devices," says Oh, who holds Sanford P. Bordeau's Chair in Electrical Engineering at the University of Minnesota. "Realizing an ideal from a computer simulation has so many challenges. Everything must be so high quality and atomically flat. That we could get such a good deal of theory and experimentation was quite surprising and exciting."


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More information:
In-Ho Lee et al., Graphene Acoustic Plasma Resonator for Ultra-Sensitive Infrared Spectroscopy, Nature Nanotechnology (2019). DOI: 10,1038 / s41565-019-0363-8

Journal reference:
Nature nanotechnology

Provided by:
University of Minnesota


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