Electrically refreshable carbon-nanotube-based gas sensors

We report electrically refreshable carbon- nanotube ( CNT)- based gas sensors with a field effect transistor ( FET) structure. The sensors can be refreshed by applying a negative gate voltage pulse in NO2 and a positive gate voltage pulse in NH3. Furthermore, the temporal response of the conductance to the gate voltage pulse is observed to be dependent on the gas species, but independent of gas concentration. These results show the possibility of distinguishing gas species using CNT- FET sensors.