Entries with tag graphene.

Researchers Model Graphene Nanoantenna

Georgia Institute of Technology researchers have successfully modeled graphene nanoantennas that could be the basis for wireless network communications between nanoscopic devices. The technology could be used to create nanomachine communication networks with applications in biomedicine, industry, and the military as well as to improve the communication of conventional devices. The researchers say graphene could generate a type of electronic surface wave able to power antennas one micron long and 10 to 100 nanometers wide to do the work of much larger metallic antennas. The material overcomes several challenges inherent in metallic antennas, including their limited range and power-hungry operation. The graphene devices will operate between 0.1 and 10 terahertz and use energy-harvesting technology to power their operations. The researchers say they intend to make a graphene nanoantenna and demonstrate its operation using a graphene-based transceiver. They are slated to publish their work in the IEEE Journal of Selected Areas in Communications. (SlashDot)(IEEE Spectrum)(Georgia Institute of Technology)

Engineers Solve a Key Issue in Graphene Use

University of California, Riverside (UCR), researchers have addressed a key problem in the worldwide effort to use graphene in electronics. Graphene is a one-atom thick layer of the mineral graphite known for being very conductive and strong. It also has interesting optical and thermal properties. This combination of properties intrigues researchers who want to use it in any number of applications. However, unlike semiconducting materials, graphene does not have an energy band gap, a property that allows a transistor to be completely turned off. Without this property, a graphene transistor would have leakage and lose power even when off, which can cause performance problems or even failure. Attempts by various researchers to create a band gap in graphene have not been successful. The UCR scientists resolved the issue by changing how information is processed in graphene circuits. Specifically, they used non-Boolean logic to convey information instead of the ones and zeroes of Boolean logic. They demonstrated the concept using a graphene field-effect transistor. The UCR researchers say their technique could be used in both microscopic and nanoscale circuits. (EurekAlert)(University of California, Riverside @ EurekAlert)(arXiv) 

New Research Shows Promise for Baked-Graphene Transistors

A multinational research team succeeded in developing graphene for electronic devices by baking the material and adding a few other ingredients. Graphene is a naturally thin material hailed for its conductivity, but it is unable to function as a semiconductor. The researchers say this solves that critical problem. Scientists from Friedrich-Alexander University Erlangen-Nuremberg and Sweden’s Acreo AB etched the surface of a silicon carbide wafer to define where the different parts of the transistor would be located. They then chemically joined a graphene layer to the underlying silicon carbide. The researchers used a small amount of hydrogen gas, which affected whether the material was conducting or semiconducting. They say their transistor worked and expect that the material could also be used to make diodes, resistors, and even integrated circuits in a single lithography step, without metallic interconnects. They published their findings in Nature Communications. (BBC)(Nature Communications)

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