Sensor lifetime semiconductor

The lifetime of metal oxide gas sensors in general is several years. Nevertheless poisoning effects can occur when exposed to silicones. An example of commercial Ga203-semiconductor gas sensors is shown in Fig. 5.32. 

Single-walled carbon nanotubes (SWNT) were proposed as nanoscale electromechanical pressure sensors [6]. It was demonstrated by computation that a pressure induced a reversible shape transition in armchair SWNTs, which in turn induced a reversible electrical transition from metal to semiconductor. The potential long lifetime nature of this pressure sensor due to the excellent mechanical durability of the carbon nanotubes was pointed out as a superior aspect. SWNTs can also be used, besides as pressure sensors, as mass, strain, and temperature sensors by sensing the resonant frequency shift of a carbon nanotube resonator when it is subjected to changes in attached mass, external loading, or temperature [7, 8]. The feasibility of such a sensor was illustrated by means of computer... 

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