Abstract
Since humidity sensors have been widely used in many sectors, a suitable humidity sensing material with improved sensitivity, faster response and recovery times, better stability and low hysteresis is necessary to be developed. Here, we fabricate a uniformly porous humidity sensor using Ca, Ti substituted Mg ferrites with chemical formula of CaMgFe1.33Ti3O12 as humidity sensing materials by solid-sate step-sintering technique. This synthesis technique is useful to control the grain size with increased porosity to enhance the hydrophilic characteristics of the CaMgFe1.33Ti3O12 nanoceramic based sintered electro-ceramic nanocomposites. The highest porosity, lowest density and excellent surface-hydrophilicity properties were obtained at 1050 °C sintered ceramic. The performance of this impedance type humidity sensor was evaluated by electrical characterizations using alternating current (AC) in the 33%–95% relative humidity (RH) range at 25 °C. Compared with existing conventional resistive humidity sensors, the present sintered electro-ceramic nanocomposite based humidity sensor showed faster response time (20 s) and recovery time (40 s). This newly developed sensor showed extremely high sensitivity (%S) and small hysteresis of <3.4%. Long-term stability of the sensor had been determined by testing for 30 consecutive days. Therefore, the high performance sensing behavior of the present electro-ceramic nanocomposites would be suitable for a potential use in advanced humidity sensors.
Highlights
A variety of techniques have been subsisted for detection of relative humidity (RH) in various systems or devices
Electro-ceramic nanocomposite humidity sensing device decreases with the increase in RH. This investigation successfully fabricated impedance or resistive type humidity sensor based on CaMgFe
1.33Ti3O12 successfully nanoceramic derived porous sintered electro-ceramic nanocomposites by using. This investigation fabricated impedance or resistive type humidity sensor based on solid-state step-sintering
Summary
A variety of techniques have been subsisted for detection of relative humidity (RH) in various systems or devices. In biomedical field, sweating is one of the great discomforts to the patients, who have to use stumps or prosthetic devices for longer period. Estimation of sweating rate is a great challenge to the researchers at the narrow zone between the socket and skin [8]. In response to the high demands of RH in wide field of applications, it is essential to develop proper RH sensors with lower cost; faster, simpler, and more unswerving detection; and higher sensitivity. Nanostructured materials significantly promote the humidity sensing properties in contrast to the conventional porous ceramic materials
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