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Sensors 2002, 2(2), 50-61; doi:10.3390/s20200050

A Ceramic Thick Film Humidity Sensor Based on MnZn Ferrite

* ,  and
Microelectronics and Semiconductor Research Group, ECE Department, National Technological Park, University of Limerick, Limerick, Ireland
* Author to whom correspondence should be addressed.
Received: 6 February 2002 / Accepted: 8 February 2002 / Published: 22 February 2002
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A ceramic thick film humidity sensor, produced from MnZn ferrite, is presented. The proposed sensing mechanism is a combination of proton hopping, hydronium diffusion, and vacancy donor traps releasing electrons into the conduction band. The sensor structure comprises a two-layer device; the first layer is an interdigitated conductor and the second layer is a 30μm thick sensing layer. The effects of sintering the sensing pastes in air and vacuum have been reported. The air-fired sample exhibits the highest humidity sensitivity (1.54%/RH%) and the lowest temperature sensitivity (0.37%/oC). The vacuum-fired sample has the lowest humidity sensitivity (0.043%/RH) and the highest temperature sensitivity (0.77%/oC). The sensitivity results indicate that the air-fired sample has the best potential for use in humidity sensing applications.
Keywords: Ceramic; Thick film; Sensor; Temperature and humidity sensitivity Ceramic; Thick film; Sensor; Temperature and humidity sensitivity
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Arshaka, K.; Twomey, K.; Egan, D. A Ceramic Thick Film Humidity Sensor Based on MnZn Ferrite. Sensors 2002, 2, 50-61.

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