Mullite 3D Printed Humidity Sensors

Mullite substrates with two different porosities were 3D printed, and tested as humidity sensors. To evaluate the effects of porosity on humidity sensitivity, the samples were sintered at 1400 °C (Sensor 1) and 1450 °C (Sensor 2). The sensors were tested in a range from 0% to 85% relative humidity (...

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Veröffentlicht in:	Ceramics 2024-06, Vol.7 (2), p.807-820
Hauptverfasser:	Milovanov, Yurii, Bertero, Arianna, Coppola, Bartolomeo, Palmero, Paola, Tulliani, Jean-Marc
Format:	Artikel
Sprache:	eng
Schlagworte:	3D printing Ammonia Analysis Carbon dioxide Curing Decomposition Design and construction Electrodes Ethanol Gases Humidity humidity sensor Manufacturing Materials Measurement Mullite Pore size Porosity Printing Recovery time Relative humidity Room temperature Sensors Sintering Sintering (powder metallurgy) stereolithography Substrates Water vapor
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Beschreibung
Zusammenfassung:	Mullite substrates with two different porosities were 3D printed, and tested as humidity sensors. To evaluate the effects of porosity on humidity sensitivity, the samples were sintered at 1400 °C (Sensor 1) and 1450 °C (Sensor 2). The sensors were tested in a range from 0% to 85% relative humidity (RH) at room temperature. When exposed to water vapor at room temperature, the impedance value dropped down from 155 MΩ under dry air to 480 kΩ under 85 RH% for Sensor 1 and from 115 MΩ under dry air to 410 kΩ for Sensor 2. In addition, response time and recovery time were below 2 min, whatever the firing temperature, when RH changed from 0% to 74%. Finally, tests carried out involving ammonia, methane, carbon dioxide and nitrogenous oxide, as well as ethanol and acetone, showed no interference.
ISSN:	2571-6131 2571-6131
DOI:	10.3390/ceramics7020053