Strategies to avoid VOC cross-sensitivity of SnO2-based CO sensors

Development of ultra-low-power consumption MOX sensors with ppb-level VOC detection capabilities for emerging applications

“…The results confirm that the FPT mode can be used to lower power consumption while changing the ULP MOX sensors selectivity, as reported also by other authors [33][34][35]. Further characterization will be necessary to tune the pulse parameters in order to obtain an optimal trade-off between power and selectivity towards the specific compounds of interest.…”

Highly sensitive NH3 sensor using Pt catalyzed silica coating over WO3 thick films

“…Among them, ZnO, WO 3 and SnO 2 have widely been studied. The gas sensing properties of these materials are related to the surface states and morphology of the material [1]. The gas sensitivity could be increased by decreasing the grain size due to high surface/volume ratio.…”

Ultra-low power metal-oxide gas sensor on plastic foil

“…Gas measurements of CO, CH 4 and NO 2 in both continuous and pulsed temperature mode have proven the proper operation of the sensors with power consumptions as low as 340 µW for the given testing scenario. Lower power might be reached by further reducing the duty cycle of the heating element.…”

“…The implemented electronic circuitry, relying on low-power electronic components, to measure the sensor's gas response and to drive the heater is also described. Pulsing the temperature has shown to improve sensitivity [4][5] and selectivity [6] while decreasing the power consumption. Thus, it potentially makes the device suitable for wireless applications.…”