Influence of Phase Position on the Performance of Chemical Sensors Based on SAW Device Oscillators

Reibel, J.; Stier, S.; Voigt, A.; Rapp, M.

doi:10.1021/ac9805504

Cited by 35 publications

(32 citation statements)

References 26 publications

(36 reference statements)

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“…(1) is often insufficient for predicting the magnitude of sensor response [29][30][31][32][33]. Positive frequency shifts have also been observed for SAW devices coated with PDMS films and exposed to selected gas phase analytes [34][35][36]. A similar, analytedependent effect has also been reported for 97 MHz SAW devices coated with polybutadiene/polystyrene films [37].…”

mentioning

confidence: 85%

ATR-FTIR spectroscopic analysis of sorption of aqueous analytes into polymer coatings used with guided SH-SAW sensors

Jones

Johnson

et al. 2005

IEEE Sensors J.

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Attenuated total internal reflectance Fourier transform infrared (ATR-FTIR) spectroscopy was used for the investigation of sorption of aqueous solutions of analytes into polymer coatings. A series of simple model polymers: poly(dimethylsiloxane) (PDMS), poly(epichlorhydrin) (PECH), and poly(isobutylene) (PIB) films and analytes: aqueous solutions of ethylbenzene, xylenes, toluene, and nitrobenzene were used to evaluate the use of ATR-FTIR spectroscopy as a screening tool for sensor development. The ratios of integrated infrared absorption bands provided a simple and efficient method for predicting trends in partition coefficients. Responses of polymer-coated guided shear horizontal surface acoustic wave (SH-SAW) sensor platforms to the series of analytes, using polymer coatings with similar viscoelastic properties, were consistent with ATR-FTIR predictions. Guided SH-SAW sensor responses were linear in all cases with respect to analyte concentration in the tested range. Comparison of ATR-FTIR data with guided SH-SAW sensor data identifies cases where mass loading is not the dominant contribution to the response of the acoustic wave sensor. ATR-FTIR spectra of nitrobenzene, coupled with computational chemistry, provided additional insight into analyte/polymer interactions.

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mentioning

confidence: 85%

ATR-FTIR spectroscopic analysis of sorption of aqueous analytes into polymer coatings used with guided SH-SAW sensors

Jones

Johnson

et al. 2005

IEEE Sensors J.

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“…The increase of inductance causes the phase curves shift towards lower frequency, while the increase of resistance causes broadening or flattening of the phase curve. It is reported that the vapor adsorption with thin coating merely moves the phase curve of the resonator towards lower frequency, whereas thick film coating causes the phase curve to flatten also [7]. It should be noted that the polymer coatings used in our case are very thin and therefore the dominant change in the equivalent circuit would appear on the inductive part.…”

Section: Discussionmentioning

confidence: 78%

“…For making sensor oscillators the static capacitances are either tuned out or made insignificant, and the oscillators are controlled by the motional arm alone. Modification of an equivalent circuit of the SAW resonator under vapor mass loading and polymer viscosity has been studied in detail by Reibel et al in [7]. Their model assumes that the adsorption of the vapor causes increases in the inductance and resistance (or adds additional inductance and resistance in series).…”

Section: Discussionmentioning

confidence: 99%

“…Improvement in sensitivity can also be achieved through improvisations in oscillator designs. Riebel et al [7] have recently reported improvement of sensitivity by tuning the phase point of oscillation in the pass band of a sensing SAW resonator device. The fast sensor response would be obtained through weak vapor-polymer interactions, but this will also result in poor sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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A comparative analysis of one-port Colpitt and two-port Pierce SAW oscillators for DMMP vapor sensing

Nimal

Singh

Mittal

et al. 2006

Sensors and Actuators B: Chemical

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“…All experiments were conducted three times using a different sensor or sensor chip for each experiment due to the irreversible nature of the BSA adsorption to the gold electrodes of the SAW sensor. As all three setups are operated with different driving electronics leading to differences in the signal height obtained for the SAW sensors (Reibel et al 1998), the response curves are normalized to the maximum value in order to make them comparable. The resulting signal curves are depicted in Fig.…”

Section: Resultsmentioning

confidence: 99%

Design and integration of a generic disposable array-compatible sensor housing into an integrated disposable indirect microfluidic flow injection analysis system

Rapp

Schickling

Prokop

et al. 2011

Biomed Microdevices

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We describe an integration strategy for arbitrary sensors intended to be used as biosensors in biomedical or bioanalytical applications. For such devices ease of handling (by a potential end user) as well as strict disposable usage are of importance. Firstly we describe a generic array compatible polymer sensor housing with an effective sample volume of 1.55 μl. This housing leaves the sensitive surface of the sensor accessible for the application of biosensing layers even after the embedding. In a second step we show how this sensor housing can be used in combination with a passive disposable microfluidic chip to set up arbitrary 8-fold sensor arrays and how such a system can be complemented with an indirect microfluidic flow injection analysis (FIA) system. This system is designed in a way that it strictly separates between disposable and reusable components- by introducing tetradecane as an intermediate liquid. This results in a sensor system compatible with the demands of most biomedical applications. Comparative measurements between a classical macroscopic FIA system and this integrated indirect microfluidic system are presented. We use a surface acoustic wave (SAW) sensor as an exemplary detector in this work.

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Influence of Phase Position on the Performance of Chemical Sensors Based on SAW Device Oscillators

Cited by 35 publications

References 26 publications

ATR-FTIR spectroscopic analysis of sorption of aqueous analytes into polymer coatings used with guided SH-SAW sensors

ATR-FTIR spectroscopic analysis of sorption of aqueous analytes into polymer coatings used with guided SH-SAW sensors

A comparative analysis of one-port Colpitt and two-port Pierce SAW oscillators for DMMP vapor sensing

Design and integration of a generic disposable array-compatible sensor housing into an integrated disposable indirect microfluidic flow injection analysis system

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