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In the last decade, Single-walled Carbon Nanotubes (SWNTs) have emerged as potential functional materials in next-generation chemical sensors due to their exceptional electronic and chemical properties. In this review, we summarize the progress that has been made in the last few years in the field of carbon nanotube chemical sensors. When a single SWNT is integrated as the channel in a carbon nanotube field-effect transistor (CNFET), ultra-low power operation down to 0.01 μW and a detection limit of 50 ppb (parts per billion) NO2 at room temperature has been achieved. Hysteresis suppression through pulsed gate sweep strategies and sensor recovery by heating and UV-exposure has been demonstrated. In case of functionalized CNT-network sensors, detection limits as low as 100 ppt (parts per trillion) has been achieved.

3.1.3 Ultra-low Power Single-walled Carbon Nanotube Based Chemical Sensors