Entries with tag nanoscale.

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)

Researchers Replicate Mona Lisa in Miniature on Substrate

Georgia Institute of Technology researchers have drawn the Mona Lisa on a substrate surface approximately 30 microns in width. They created the black-and-white Mini Lisa to demonstrate a nanomanufacturing technique known as thermochemical nanolithography. The researchers generated the image pixel by pixel—each 125 nanometers from its neighbor—using varying heat intensities from a controlled, nanoscale chemical reaction in each location to produce the image’s different shades of gray. The demonstration shows the precision and control with which this process can produce chemical concentration gradients and variations on a sub-micrometer scale. The researchers say thermochemical nanolithography is accessible because atomic force microscopes are used, which are fairly common. . The method is also fast, and it could be used for patterning gradients in nanoelectronics, optoelectronics, and bioengineering. Researchers from the US Lawrence Berkeley and Pacific Northwest National Laboratories and from the University of Illinois at Urbana-Champaign collaborated on the project. The scientists published their work in the online journal Langmuir. (EurekAlert)(Georgia Institute of Technology)(Langmuir) 

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