Scientists from the University of Wisconsin-Madison have recently achieved a breakthrough in the manufacture of carbon nanotube transistors. The new high-performance carbon nanotube transistor developed by it successfully breaks through the two major problems of purity and array control. It achieves 1000 times faster switching speed than ordinary silicon transistors and 100 times faster than the previous fastest carbon nanotube transistors. Achievements. Carbon nanotube transistors have taken a crucial step toward commercial use. Related papers were published in the Journal of the American Chemical Society Nano.
Carbon nanotubes are tubular materials formed by rolling up a single layer of carbon atoms. As a semiconductor material, carbon nanotubes have many advantages over silicon's natural properties, in which electrons can be transferred more easily than silicon transistors and can be realized more easily. Rapid data transmission has long been considered an ideal material for the manufacture of next-generation transistors. In addition, this material also has good strength and flexibility, can be used to make flexible displays and electronic devices, stand up to stretching and bending, so that electronic devices can be integrated into clothes or other wearable devices.
However, the manufacture of high performance carbon nanotube transistors faces two major technical challenges. The first is to achieve high purity, because metal impurities in carbon nanotubes will lead to equipment short circuit like copper wire, only high purity can obtain high efficiency; Second, the array control with extremely high precision, a large number of carbon nanometers Tubes inserted into fingernail-sized chips must accurately control the distance between individual carbon nanotubes.
In the new study, the research team led by Michael Arnold, associate professor of materials science at the University of Wisconsin-Madison, and Professor Padma Koplan successfully overcame these two difficulties. With more than two decades of accumulation in the field of carbon nanotubes, they used polymer screening technology to find solutions for manufacturing high-purity carbon nanotube semiconductors. Then the problem of arraying carbon nanotubes was solved with a technique called "floating evaporation self-assembly (FESA)".
The physicist's organization network reported on January 15th that the previous technical precision control was poor and the density of carbon nanotube filling was either too sparse or too tight. Researchers at the University of Wisconsin-Madison have solved this problem by triggering the self-assembly of carbon nanotube solutions by rapid evaporation. The team once described the technology in the 2014 academic journal Langmuir of the American Chemical Society.
Arnold said: "This is not a simple improvement. With these results, we have made a quantum leap in the development of carbon nanotube transistors. The new carbon nanotubes are far superior in performance to thin-film transistors currently used in industry. Advances have made it possible for carbon nanotube transistors to replace silicon chips, which have reached their limits in size and performance. In addition to paving the way for a new generation of consumer electronics, this technology may also be used industrially and militaryally."
It is reported that Arnold’s team has applied for a patent for this technology through the University of Wisconsin Alumni Research Foundation and has made contact with some companies. (Reporter Wang Xiaolong)
Flanges
Standard Flange,Forged Square Flange,Alloy Flanges,Stainless Steel Flanges,Carbon Steel Flanges
Torich International Co.,Ltd--The Steel Tube Maker , http://www.chinasteeltubepipe.com