Theoretical Analysis of Acoustoelectrical Sensitivity in SAW Gas Sensors

Jakubik, W.; Powroźnik, Paulina; Wrotniak, J. A.; Krzywiecki, Maciej; Hejczyk, T.

doi:10.1016/j.proeng.2015.08.844

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…In case of bi-layer structures, the AE sensitivity is a function of the surface electrical conductivities of the both films [6,9]. Excitation of SAW through the associated electric potential SAW = , causes the appearance of two different densities of space charge e1 and e2 in each film.…”

Section: Results For Bi-layer Sensor Structuresmentioning

confidence: 99%

“…It has been presented, that in such configurations there were new ranges for the acoustoelectric parameter , where the acoustoelectric sensitivity could be much higher than for a single sensor film structure [6]. Therefore the analysis of acoustoelectrical (AE) sensitivity is very necessary in order to achieve the best SAW sensor performance [7][8][9][10][11] …”

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of acoustoelectrical sensitivity in SAW gas sensors with single and bi-layer structures

Jakubik

Powroźnik

Wrotniak

et al. 2016

Sensors and Actuators B: Chemical

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Section: Results For Bi-layer Sensor Structuresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of acoustoelectrical sensitivity in SAW gas sensors with single and bi-layer structures

Jakubik

Powroźnik

Wrotniak

et al. 2016

Sensors and Actuators B: Chemical

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“…By comparing the responses of the sensors it was observed that thicker films produce higher responses than thinner films: this effect can be attributed to the large number of absorption centers of water molecules present in thicker films. On the other hand, the larger phase shifts observed for the 3rd harmonic SAW in LiNbO 3 , in comparison to the 1st one, was attributed to the larger operating frequency which enables higher sensitivity due to the mass loading effect, as opposed to the acoustoelectric effect which is not effective versus the frequency in the single layer/substrate sensor configuration [ 31 , 32 , 33 , 34 , 35 ].…”

Section: Discussionmentioning

confidence: 99%

SAW Humidity Sensing with rr-P3HT Polymer Films

Jakubik,

Wrotniak,

Caliendo

et al. 2024

Sensors

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In the present paper the humidity sensing properties of regioregular rr-P3HT (poly-3-hexylthiophene) polymer films is investigated by means of surface acoustic wave (SAW) based sensors implemented on LiNbO3 (1280 Y-X) and ST-quartz piezoelectric substrates. The polymeric layers were deposited along the SAW propagation path by spray coating method and the layers thickness was measured by atomic force microscopy (AFM) technique. The response of the SAW devices to relative humidity (rh) changes in the range ~5–60% has been investigated by measuring the SAW phase and frequency changes induced by the (rh) absorption in the rr-P3HT layer. The SAW sensor implemented onto LiNbO3 showed improved performance as the thickness of the membrane increases (from 40 to 240 nm): for 240 nm thick polymeric membrane a phase shift of about −1.2 deg and −8.2 deg was measured for the fundamental (~78 MHz operating frequency) and 3rd (~234 MHz) harmonic wave at (rh) = 60%. A thick rr-P3HT film (~600 nm) was deposited onto the quartz-based SAW sensor: the sensor showed a linear frequency shift of ~−20.5 Hz per unit (rh) changes in the ~5–~50% rh range, and a quite fast response (~5 s) even at low humidity level (~5% rh). The LiNbO3 and quartz-based sensors response was assessed by using a dual delay line system to reduce unwanted common mode signals. The simple and cheap spray coating technology for the rr-P3HT polymer films deposition, complemented with fast low level humidity detection of the tested SAW sensors (much faster than the commercially available Michell SF-52 device), highlight their potential in a low-medium range humidity sensing application.

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