Journal
CHEMOSENSORS
Volume 9, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/chemosensors9070170
Keywords
TiO2 nanoparticles; gold nanoparticles; humidity sensing; water adsorption; desorption
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This paper investigates humidity sensing using TiO2 nanoparticles through impedance measurements, showing large responses in the relative humidity range from 30% to 80% attributed to condensation in nanopores. The addition of Au nanoparticles dramatically reduces sensing film response and recovery time, with a preference for condensation when relative humidity exceeds 70%.
In this paper, we investigate humidity sensing through impedance measurements with TiO2 nanoparticles (about 6 nm in diameter). The transient behavior and the impedance spectra are measured and interpreted from the theoretical point of view. Large responses are shown especially in the relative humidity range from 30% to 80%, which are essentially explained by condensation in the nanopores. The effect of the addition of Au nanoparticles is investigated and as expected, the Au/TiO2 interfaces allow for dramatically reducing the sensing film response time and above all, its recovery time; moreover, it seems to favor condensation when the relative humidity overcomes 70%.
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