Fujitsu Laboratories announced last week they have developed a process to manufacture sheets of pure carbon, multi-walled perpendicular nanotubes (CNTs). The uniformly arrayed tubes are aligned in the direction of heat removal so that they can be used as heat sinks for a number of electronic applications including silicon carbon devices employed in electric vehicles and in high-performance computing.
Fujitsu says its CNT sheets can dissipate heat at a rate of 80 watts-per-meter Kelvin even with contact resistance included. That is roughly three times the thermal conductance of indium sheets, a material known for its high thermal conductivity, which makes Fujitsu’s technology the world’s top heat-dissipation performer, the company claims.
CNTs’ inherent usefulness as heat-dissipation material has long been known, but exploiting this characteristic in anything other than the simplest of applications has been a headache for material scientists.