Journal ArticleDOI
Thick-film humidity sensors
TLDR
The results of an investigation of thick-film humidity sensors based on ceramic materials are discussed in this article, where the role of each part of the sensitive material in the electrical conduction process is determined on the basis of measurements and calculated equivalent circuits.Abstract:
The results of an investigation of thick-film humidity sensors based on ceramic materials are discussed in the paper. Thick-film technology is very promising for the production of low cost sensors based on ceramic materials. The technology gives the possibility for reproducible production of sensors with a defined microstructure, determined porosity and proper structure of grains and grain boundaries. Ceramic sensors have advantages over polymer sensors due to their better thermal stability and resistance to chemicals. Properties of thick-film planar humidity sensors based on - (ZCT) ceramics are presented. The influence of and Si additives, as well as firing temperature, on the sensor characteristics are discussed. Impedance spectroscopy measurements determined the correlation between the technological parameters and the electrical properties of humidity sensors. The role of each part of the sensitive material in the electrical conduction process is determined on the basis of measurements and calculated equivalent circuits. The proposed model describes the frequency characteristics at various relative humidities with very good fit to the experimental data. A new approach to the modelling of the impedance frequency dependence by means of an equivalent circuit yields very promising results for sensors.read more
Citations
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Humidity Sensors Principle, Mechanism, and Fabrication Technologies: A Comprehensive Review
TL;DR: A significant aim of this review is to provide a distinct categorization pursuant to state of the art humidity sensor types, principles of work, sensing substances, transduction mechanisms, and production technologies.
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Recent achievements in miniaturised humidity sensors—a review of transduction techniques
TL;DR: A review of miniaturized humidity sensors is presented in this article, focusing on the integration issues and technological challenges of the miniaturised humidity sensors, and focusing on capacitive-, hygrometric-, gravimetric-, optical and integrated sensors.
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Building energy metering and environmental monitoring – A state-of-the-art review and directions for future research
TL;DR: The paper provides a comprehensive understanding of available technologies for energy metering and environmental monitoring; their drivers, advantages and limitations; factors affecting their selection and future directions of research and development – for use for generating further interest in this expanding research area.
Journal ArticleDOI
Nanocrystalline nickel ferrite thick film as an efficient gas sensor at room temperature
Ramesh B. Kamble,Vikas L. Mathe +1 more
TL;DR: In this paper, Ni ferrite nano-particles were prepared using chemical co-precipitation technique using X-ray diffraction data and fine powder resulted from the reaction was used to prepare gas sensing elements in pellet and thick film forms.
Journal ArticleDOI
Novel Microsystem Applications with New Techniques in Low-Temperature Co-Fired Ceramics
Kenneth A. Peterson,Kamlesh D. Patel,Clifford K. Ho,Steven B. Rohde,Christopher D. Nordquist,Charles A. Walker,B. D. Wroblewski,Murat Okandan +7 more
TL;DR: Low-temperature co-fired ceramic (LTCC) enables development and testing of critical elements on micro-system boards as well as non-microelectronic meso-scale applications.
References
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Journal ArticleDOI
Ceramic sensors for humidity detection: the state-of-the-art and future developments
TL;DR: In this paper, the performance of ionic-type humidity sensors by the addition of alkali ions is explained in terms of influence on the microstructure and on the intrinsic impedance.
Journal ArticleDOI
Impedance Spectroscopy of Hydrating Cement‐Based Materials: Measurement, Interpretation, and Application
B. J. Christensen,B. J. Christensen,R. Tate Coverdale,R. Tate Coverdale,Rudolf A. Olson,Rudolf A. Olson,S. J. Ford,S. J. Ford,Edward J. Garboczi,Edward J. Garboczi,Hamlin M. Jennings,Hamlin M. Jennings,Thomas O. Mason,Thomas O. Mason +13 more
TL;DR: In this article, the state of the art for use of impedance spectroscopy for studying the evolving microstructure of cement-based materials during hydration is discussed and features of the spectra are discussed and related to components of the micro-structure with the assistance of pixel-based computer modeling techniques.
Book
Thick film sensors
TL;DR: In this paper, Prudenziati et al. present and future of thick film sensors, M. Dell' Acqua pastes, inks and slurries, R.T. Brignell substrates for thick-film technology.
Journal ArticleDOI
Humidity-sensitive electrical response of sintered MgFe2O4
TL;DR: In this paper, the microstructural properties of MgFe2O4 sintered porosity and pore-size distribution were analyzed using electrochemical impedance spectroscopy (EIS).