Best of both worlds

A team of researchers at Rensselaer Polytechnic Institute in New York has created hybrid structures that combine the best properties of carbon nanotubes and metal nanowires.



The new structures could help overcome some of the key hurdles to using carbon nanotubes in computer chips, displays, sensors, and many other electronic devices.



The high conductivity of carbon nanotubes makes them promising materials for a wide variety of electronic applications, but techniques to attach individual nanotubes to metal contacts have proven challenging. The new approach allows the precise attachment of carbon nanotubes to individual metal pins, offering a practical solution to the problem of using carbon nanotubes as interconnects and devices in computer chips.



‘This technique allows us to bridge different pieces of the nanoelectronics puzzle, taking us a step closer to the realisation of nanotube-based electronics,’ said Fung Suong Ou, a graduate student in materials science and electrical engineering at Rensselaer.



For example, carbon nanotubes display amazing mechanical strength, and they are excellent conductors of electricity, with the capacity to produce interconnects that are many times faster than current interconnects based on copper. Gold nanowires also have very interesting optical and electrical properties, and they are compatible with biological applications.



‘In order to take full advantage of these materials, we demonstrate the idea of combining them to make the next generation of hybrid nanomaterials,’ Ou said. ‘This approach is a good method to marry the strengths of the two materials.’



The metal nanowires in this technique are made using an alumina template that can be designed to have pore sizes in the nanometre range. Copper or gold wires are deposited inside the pores, and then the entire assembly is placed in a furnace, where a carbon-rich compound is present. When the furnace is heated to high temperatures, the carbon atoms arrange themselves along the channel wall of the template and the carbon nanotubes grow directly on top of the copper wires.



‘It’s a really easy technique, and it could be applied to a lot of other materials,’ Ou said. ‘The most exciting aspect is that it allows you to manipulate and control the junctions between nanotubes and nanowires over several hundred microns of length. The alumina templates are already mass-produced for use in the filter industry, and the technique can be easily scaled up for industrial use.’



To date the team has made hybrid nanowires that combine carbon nanotubes with both copper and gold. But they also are currently working to connect carbon nanotubes to a semiconductor material, which could be used as a diode, according to Ou.