For decades, silicon has been the preferred material for electronic devices, but its efficiency has begun to reach its limit. The next step may be carbon transistors and circuits, and now engineers at UC Berkeley have created metallic graphene nanoribbons that can be used as wires for all carbon electronics. Moore’s law is a theory describing the speed of technological progress, claiming that the number of transistors that can be accommodated in integrated circuits doubles about every two years. Although this has been the case for decades, in recent years, as we have reached the physical limits of silicon, its development has slowed down. < / P > < p > rich in carbon resources, cheap in price and in various forms, is an important competitor to maintain Moore’s law, especially if all carbon circuits can be realized. Graphite, diamond and carbon nanotubes are all in the form of carbon and have been proved useful in various electronic components. But perhaps the most promising is graphene. And even these things can have different shapes – as sheets, tiny quantum dots, or long, thin nanobelts;. < p > < p > the team at the University of California, Berkeley, is now breaking through in the last shape. Graphene nanoribbons are usually semiconductors, but the team has succeeded in turning them into metals, which makes them conductive and able to carry electrons in circuits like wires. < / P > < p > “we think the wire is really a breakthrough,” said Felix Fischer, author of the study. “This is the first time we have been able to consciously create a very narrow metal conductor – a good, internal conductor – out of carbon based materials without external doping.” < / P > < p > to create these metal nanobelts, the team used heat to splice short segments of the nanobelts together to create a conductive wire tens of nanometers long and only 1.6 nanometers wide. After completion, the researchers found that the nanoribbons have the electronic properties of metals, each segment contributing only one conducting electron, which can then flow freely along the belt. Finally, the team made a small change to the structure to further improve its performance. < / P > < p > “using chemical principles, we created a small change, with only one chemical bond change in every 100 atoms, but it increased the metallicity of nanobelts by 20 times. From a practical point of view, this is very important to make it an excellent metal.” Michael crommie, the study’s author, said. < / P > < p > while carbon nanotubes are excellent conductors and show promise in electronics, the team says they are harder to manufacture on a large scale. Nano carbon tape is easier to batch manufacture, making all carbon electronic products more feasible. < / P > < p > “carbon nanoribbons allow us to obtain a wide range of structures chemically using a bottom-up manufacturing method, which is not yet possible in nanotubes,” crommie said. “This allows us to basically sew electrons together to create metal nanoribbons, something we haven’t done before. This is one of the major challenges in the field of graphene nanoribbon technology, and it’s why we’re so excited about it. ” [image] Google secretly tests 6GHz networks in 17 states of the United States

By ibmwl