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Schematic of the sensor design (a), where PSi particle solution is deposited on top of an interdigitated electrode configuration. Photograph of a drop-cast PSi sensor on a glass substrate (b). The inset displays an optical micrograph showing a silver electrode line and a layer of PSi particles on top. Some larger particle-agglomerates can clearly be distinguished from the sensing layer.
Particle size distribution of the PSi particles, determined with dynamic light scattering.
Sensor response to a step-wise relative humidity sweep ranging from 95 to 0 RH% (a), and the corresponding hysteresis curve determined from the measurement (b).
Sensor response to RH modulation between 0% and 90% (a). Final humidity pulse to 95 RH% demonstrates that the sensitivity is well below 5 RH%, even for higher humidity values. Sensor response and the corresponding time constant , when RH content is raised from 0% to 90% (b). Time constant value is 36 s.
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