Carbon Nanotube Technology

Making nanotubes into transistors has been a painstaking process & this complexity is being removed by Carbon nanotubes material for making display control circuits because they’re more efficient than silicon and can be arrayed on flexible surfaces. Now researchers at the University of Southern California have demonstrated large, functional arrays of transistors made using simple methods from batches of carbon nanotubes that are relatively impure.

Today most of technologies utilized the proper array of transistors, as in the case of a computer or television screen, whether it’s an LCD or plasma, are each controlled by several transistors. These transistors are made from silicon. Arrays of these transistors need to be made at high temperatures and in a vacuum, so they’re very expensive according to Chongwu Zhou, an associate professor of electrical engineering at USC and researcher on the nanotube project.

Now a days, advance technology takes new shape with sharp turn with carbon nanotube transistors, Many people use one nanotube to make a very small, high-performance transistor. “If we use one nanotube for one transistor, the yield will never be high enough” to work for large-scale manufacturing of big screens, he says. Zhou believes his approach will solve this problem by making larger transistors from mats of nanotubes.

The USC researchers make large arrays of carbon nanotube transistors using solution-processing techniques at room temperature. They start by placing a silicon wafer in a chemical bath to coat its surface with a nanotube-attracting chemical, then rinse off the residue. The treated wafer is then immersed in a solution of semiconducting carbon nanotubes, which are attracted to its surface. The wafer, now coated with a carpet of nanotubes, is rinsed clean again. To make transistors from this tangled mess, the researchers put down metal electrodes at selected locations. The electrodes define where each transistor is and carry electrons into and out of the nanotubes that lie between them. Areas of silicon underlying each device act as the transistors’ gates. So far, they’ve built a prototype device on a four-inch silicon wafer and used it to control a simple organic light-emitting diode display.