Abstract
A relative humidity sensor was produced by carbon laser patterning of a carbon precursor ink on a flexible substrate. Citric acid and urea, both inexpensive and naturally abundant molecules, are us...
Highlights
The development of new lab-on-a-chip sensors is essential to move toward miniaturization of devices, realization of sensor arrays, and their applications for on-site analysis.[1]
For atmospheres containing more than 70% of relative humidity, the equilibrium constant tends toward a constant value different for every temperature
A resistive humidity sensor has been fabricated using carbon laser patterning on a flexible substrate (PET) of our in-house developed carbon precursor ink
Summary
The development of new lab-on-a-chip sensors is essential to move toward miniaturization of devices, realization of sensor arrays, and their applications for on-site analysis.[1]. Before changing the relative humidity inside the chamber, the resistance of the sensor was studied as a function of temperature at a constant humidity (Figure 2) For atmospheres containing more than 70% of relative humidity, the equilibrium constant tends toward a constant value different for every temperature This evolution suggests that the sensor surface begins to be saturated with H2O and the adsorption is slowing down. The sign of the standard enthalpy is negative because the water adsorption is favored on the sensor, explaining why 20 min of desorption is required at 10 and 20 °C compared to only 10 min of adsorption to reach the equilibrium This value is in good agreement with those reported in the literature.[55,56] pubs.acs.org/acsaelm
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