Nano-Soldering Process,Improving Device Performance

Nano-Soldering Process,Improving Device Performance 

University of Illinois researchers have developed a way to heal the gap in the wire is too small, even the world's smallest soldering iron .

Of electrical and computer engineering professor Joseph Lyding and graduate students Jae Won to make LED, Illinois team published its results in the journal Nano Letters .

Carbon nanotubes are the same only one atom thick tiny hollow wire - like graphene , but cylindrical. Researchers have been exploring them as transistors in place of conventional silicon , carbon nanotubes are easy to transport due to the alternate substrates , such as plastic sheets , low-cost flexible electronics or flat panel display .

Itself is a high quality carbon nanotube conductors , it is suitable as a transistor to create a single tube is very difficult . Nanotube arrays easier to make , but is now jump from one to the next nanotubes , slowing down through the intersection . In the standard wires, this intersection will be welded , but how could such a small gap will be bridged in ?

" It happens , I think that when you pass a current through them these nanotube junctions become hot , said :" Lyding, " a bit like a wiring fault in a family can create a hot spot in our example , we use these local hot spots caused by the chemical . response " deposit metal , nano- solder junction.

Team collaboration with Eric Lyding pop, associate professor of electrical and computer engineering , and John Rogers , a professor Swanlund, materials science and engineering, for the synthesis of carbon nanotubes and transfer experts, and chemistry professor Greg Girolami . Girolami gas in the deposition process using the metal on the surface of experts called chemical vapor deposition (CVD).

Nano- welding process is simple and self- regulation. CNT array is placed in a metal chamber pumping gas molecules cheerful . When a current flows through the transistor , the junction is heated , because the resistance of the nanotube , as a flow of electrons from the next . Molecular reaction heat , the deposition of metal in hot and effectively " welded " junction . Then the resistance decreases , and the temperature , so the reaction was stopped .

Welding only a few nano- seconds , and an order of magnitude increase device performance - almost a carbon nanotube manufacturing apparatus from a single level , but more easily mass produced .

"It would be very easy to insert an existing process CVD process flow ," Lyding said. " Chemical vapor deposition technology is commercially available ready-made shelves. People can make these transistors to open them , so this process can be done and then , when it is completed , they can complete the wiring and the ability to connect to the circuit. Ultimately , it will be a low-cost process . "

Currently, the group is working to improve the process .

"We think we can make it better ," Lyding said. "This is a prelude , we hope , but it is actually quite remarkable ."

Engineers antibody synthesis of carbon nanotubes

MIT chemical engineers have developed a new way to produce nanoparticles that can recognize specific molecules , opening up new ways to build lasting sensors for many different compounds , including applications.

To create these "synthetic antibodies ," the researchers to use carbon nanotubes - carbon exposure to the laser fluorescence hollow , cylindrical nanometers thick . In the past, researchers have used this phenomenon by using a molecule , such as a natural antibody , which binds to a specific target to create a carbon nanotube sensors . When the target is hit , the carbon nanotube fluorescence brighter or darker.

The MIT team found that they can use a specially designed amphiphilic polymer nanotubes to create new sensors - are attracted to the oil and water, polymers, like soap. This method provides a huge array of different target specific recognition sites , and can be used to create a sensor for monitoring disease such as cancer , inflammation, diabetes , or the life of the system .

" This new technology has given us an unprecedented ability by screening nanotube - polymer composites to create a synthetic analogue of antibody function to identify any target molecule , " said Michael Strano , a professor of chemical engineering carbon P. DUBBS in Ma Polytechnic Institute and senior author of the study , said the province , appeared on Nov. 24 online edition of Nature Nanotechnology .

The main author of the paper is the recent recipient Dr. Zhang Qing mirror , postdoctoral Markita Landry , and former postdoctoral Paul Barrow and bell -ho .