Two-dimensional graphene transistors. Free Technical Library News

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XNUMXD graphene transistors

06.02.2013

American physicists have taken a big step towards two-dimensional graphene electronics, having learned to apply an insulator layer to arbitrary sections of a sheet of "Nobel" carbon, which allowed them to make ultra-thin transistors from graphene, according to an article published in the journal Nature Nanotechnology.

Since the discovery of graphene in 2004 by Russian-British physicists Andrei Geim and Konstantin Novoselov, scientists have been trying to adapt this material to create electronics. Similar problems - high leakage currents, difficulties in working with graphene and problems in applying an insulator substrate prevent physicists from creating transistors adapted for industrial production.

A group of scientists led by Pulickel Ajayan of Rice University in Houston (USA) solved the latter problem by learning how to draw arbitrary "patterns" from the insulator on sheets of graphene using a laser. According to the technology of Ajayan and his colleagues, the substrate is made first. To do this, scientists spray molecules of an insulator, boron nitride, onto a thin metal plate, and apply a special polymer to some parts of this “sandwich”. Then the physicists "cut out" the polymer-free areas of the substrate with a laser, remove the protective layer and grow a layer of graphene directly on it.

As the researchers note, this design has all the necessary properties for its transformation into a transistor. As a demonstration, scientists have made several "flat" transistors with a size of 100 nm, which are not inferior to silicon counterparts. In addition, Ajayan and his colleagues note that their technology is compatible with modern methods of microelectronics production, which will allow it to be used to create microchips in the near future.

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Washing machine for dogs 11.03.2002

Spanish engineers Eduardo Segura and Andree Diaz created a dog washing machine in three years of intensive work. The machine, called "Lavacan" (from the Spanish words for "wash the dog"), lathers, washes and dries the animal enclosed inside in less than half an hour.

Like any washing machine, it has several programs for animals of different breeds and sizes, as well as for washing with insecticidal shampoo (this procedure takes longer than a simple wash). Along with washing, hydromassage is carried out. According to the inventors, dogs tolerate washing in the car well, many even like the procedure, and one dog fell asleep peacefully during drying. The inventors believe that their machine is also suitable for washing cats, but cats do not think so.

The industrial production of "Lavakan" has already been established, the car costs about 20 thousand dollars and is purchased mainly by professional breeders and dog beauty salons.

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