A molecule with two unpaired electrons too unstable to be made by chemical synthesis was fabricated using a scanning probe microscope to remove two hydrogen atoms from a single molecule adsorbed to a copper surface at ultra low temperature and ultra high vacuum.
Atomically precise chevron-shaped graphene nanoribbons were purified after solution synthesis, cleanly placed by dry contact transfer on a hydrogen-passivated Si surface, imaged and manipulated by scanning tunneling microscopy, and covalently bonded to depassivated surface positions.
The ability to dope graphene nanoribbons with boron atoms to atomic precision opens a range of possible new applications, from chemical sensing to nanoelectronics to photocatalysis to battery electrodes.
A nanoribbon transistor no thicker than the distance between adjacent DNA bases provides high resolution sensing of DNA passage through nanopores, perhaps leading eventually to rapid DNA sequencing.
How complex could circuits be made using precisely positioned DNA nanostructures as templates to grow graphene nanoribbons?
A review article presents the amazing features of graphene and discusses how it might complement or replace silicon for the fabrication of electronic devices.
Phaedon Avouris, winner of the Feynman Prize in 1999, is head of the nanoscale science and technology group At IBM, which has recently reported significant advances in synthesizing transistors from graphene using conventional lithography methods. IBM Demonstrates Graphene Transistor Twice as Fast as Silicon Graphene transistors promise 100GHz speeds Graphene Transistors that Can Work at [...]
Two research groups have published two different ways to unzip carbon nanotubes to create graphene ribbons.
Two papers in a recent issue of Science suggest that graphene is rapidly moving from being “just” a nanotech wonder material to becoming relevant to atomically precise nanotechnologies.
The recent demonstration of the ability to “fully engineer the electronic band gap of graphene” is a major advance in the top-down approach to nanotech applications that take advantage of the many marvelous properties of graphene.
Researchers have demonstrated atomically precise cuts through a few graphene layers.
In yet another step toward making nanotech transistors from graphene nanoribbons, chemically-prepared graphene nanoribbons less than 10 nm wide were found to be uniformly room-temperature, field-effect transistors.
BuffYoda writes "BERKELEY, CA — "Another important step towards realizing the promise of lightning fast photonic technology has been taken by scientists with the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California at Berkeley. Researchers have demonstrated that semiconductor nanoribbons, single crystals measuring tens of hundreds of microns in length, but only a few hundred or less nanometers in width and thickness (about one ten-millionth of an inch), can serve as 'waveguides' for channeling and directing the movement of light through circuitry." An interesting (though by no means unexpected or revolutionary) development in photonics, a field I consider to be of great importance to the development of extremely fast computers (this route seems to be a lot closer than the alternatives)."