Measurements results of SAW humidity sensor with nafion layer

Kawalec, A.; Jasek, K.; Pasternak, M.

doi:10.1140/epjst/e2008-00529-x

Cited by 16 publications

(6 citation statements)

References 5 publications

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“…The method is successfully used in SAW sensor fabrication (Kawalec et al, 2008) but it requires sophisticated vacuum equipment and is very time consuming. Apart from that, Nafion evaporation at the temperature above 200…”

Section: Nafion Depositionmentioning

confidence: 99%

“…Langemuir-Blodget method (Roberts, 1990), spinoff, painting, and atomisation, which in turn is subdivided into the pneumatic atomisation (Zimmermann et al, 2001), piezoelectric atomisation, or electrospraying (Sarkar et al, 2006). Apart from the methods already listed there are some physical methods applicable to bulk materials, and these include vacuum evaporation: thermal method, electron beam method, and laser ablation (Hassmann, Gould, 1992;Kawalec et al, 2008;Piqué et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Deposition of Polymer Sensor Films on SAW Surface by Electrospraying Technology

Jasek¹,

Pasternak²,

Grabka³

et al. 2017

Archives of Acoustics

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One of the most important problems with regard to the Surface Acoustic Wave (SAW) gas sensors technology is the deposition of chemosensitive films exhibiting desirable chemical and physical properties. The electrospraying technology seems to be a very promising method of the film deposition in this case. It allows the chemosensitive layers to be obtained out of almost any chemicals and their mixtures in a controllable way. The process gives the possibility to generate specific films with properties unattainable if other methods were to be applied. For example, it allows to deposit solutions of polymers and suspensions of solids in polymer solutions which can degrade in the process of thermal evaporation deposition.The paper describes the results of experiments with electrospraying technique in order to obtain Nafion films. The influence of the process parameters on film sensitivity has been studied.

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Section: Nafion Depositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Deposition of Polymer Sensor Films on SAW Surface by Electrospraying Technology

Jasek¹,

Pasternak²,

Grabka³

et al. 2017

Archives of Acoustics

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“…The sensing dynamic was acceptable, while the material exhibited a large hysteresis value. 11 However, the moisture resistance of this type of sulfonated material is not so satisfactory, and the sensor made by the polystyrene skeleton is unstable under high RH. Recently, other kinds of sulfonated polymers based on aromatic polymers, whose skeletons are more rigid and could resist moisture, have attracted our attention as new candidates for humidity sensing such as polyimide, 12 poly (arylene ether sulfone), 13 and poly (arylene ether ketone) (PAEK).…”

Section: Introductionmentioning

confidence: 99%

Investigations of the humidity sensing properties of side-chain-type sulfonated poly (arylene ether ketone)s

Meng

Zhuang

Zhang

et al. 2019

High Performance Polymers

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Side-chain-type sulfonated poly (arylene ether ketone)s containing naphthalene moieties with a degree of sulfonation (Ds) from 0.2 to 1.9 were synthesized. Humidity sensors were fabricated by cast coating on silver–palladium interdigital microelectrodes. The properties of this series of materials in terms of water absorption, glass transition temperature, and humidity sensing were characterized in detail. The investigations on the humidity sensing performance showed that with the increase in the Ds, the hysteresis of our materials exhibits an increasing trend first, followed by a decrease. This special phenomenon has not been reported before and caught our attention. From the results of humidity sensing properties, among the materials, the one with 0.2 Ds is promising for applications in humidity sensing due to its small hysteresis and fast response to varied relative humidity (RH). For a better understanding of the humidity sensing behavior of the sensor, complex impedance spectra were also measured. In the long-term stability measurement, the deviation of the measured impedance of the sensor at 97% RH is not obvious, proving good stability in a humid environment.

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“…The results obtained by means of the numerical models were compared with experiment results. Sensors with an acoustic surface wave are used in many fields, especially in biochemical applications (Anisimkin, Verona, 2001), monitoring DNA (Reibel, Stahl, 2000) as well as monitoring the physical and chemical properties of solids (Pustelny et al, 2008;Pustelny, Pustelny 2009), monitoring the quality of food (Ceeke et al, 1999), and measurements of humidity (Kawalec et al, 2008). New possibilities of applying surface acoustic wave sensors allow to detect the toxic gases, among others -carbon monoxide -silent killer.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Analysis of the Response of a SAW Structure with WO3 Layers on Action of Carbon Monoxide

Hejczyk

Urbańczyk²,

Pustelny³

et al. 2015

Archives of Acoustics

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The paper presents the results of an analysis of gaseous sensors based on a surface acoustic wave (SAW) by means of the equivalent model theory. The applied theory analyzes the response of the SAW sensor in the steady state affected by carbon monoxide (CO) in air. A thin layer of WO3 has been used as a sensor layer. The acoustical replacing impedance of the sensor layer was used, which takes into account the profile of the concentration of gas molecules in the layer. Thanks to implementing the Ingebrigtsen equation, the authors determined analytical expressions for the relative changes of the velocity of the surface acoustic wave in the steady state. The results of the analysis have shown that there is an optimum thickness of the layer of CO sensor at which the acoustoelectric effect (manifested here as a change in the acoustic wave velocity) is at its highest. The theoretical results were verified and confirmed experimentally.

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Measurements results of SAW humidity sensor with nafion layer

Cited by 16 publications

References 5 publications

Deposition of Polymer Sensor Films on SAW Surface by Electrospraying Technology

Deposition of Polymer Sensor Films on SAW Surface by Electrospraying Technology

Investigations of the humidity sensing properties of side-chain-type sulfonated poly (arylene ether ketone)s

Numerical and Experimental Analysis of the Response of a SAW Structure with WO3 Layers on Action of Carbon Monoxide

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