Researchers fromt the University of Illinois have developed a method of identifying and removing the metallic carbon nanotubes in an array without damaging the semiconducting carbon nanotubes. The method is nearly 100% effective and scalable to large arrays. This technology enables the large-scale creation of CNT arrays with a very high I on/I off ratios. A larger ratio means less lost power while off, faster switching time, and lower operating voltage. This technology was developed in the laboratory of Dr. John Rogers, who has received international recognition for his work on bio-integrated electronics.