Carbon Nanotubes and Graphene - Research and Applications

Researchers showed that multi-walled carbon nanotubes have gas pressure and gas species sensing capability which is based on electro-thermal effect: heated nanotubes exposed to gaseous environments change their resistance depending on the gas molecules. The gas sensing device was constructed by synthesising suspended multi-walled carbon nanotubes locally by chemical vapor deposition. The measurements could differentiate between gas species and showed sensitivity to vacuum pressure. These sensors are compact, have fast and reversible responses and can be integrated with the existing microelectronics.