American researchers have made transistor radios which are smaller than a grain of sand but can outperform regular radios. Scientists from the University of Illinois used tiny strands of carbon atoms, known as carbon nanotubes, to make the radio.
They circumvented technical problems by using quartz wafers to manufacture the device. On being tested, the nano radio easily picked up signals from a nearby station. The reception was far better than silicon-based radios.The strands used in the radio are hundreds of thousand times smaller than the human hair.
Prof John Rogers, who headed the team, said that the ultimate aim of the research was to develop high-performance semiconductors from the nanotubes.