Temperature effect and chemical response of surface acoustic wave (SAW) single-delay-line chemosensors

Liron, Zvi; Greenblatt, Jeremy; Frishman, Gad; Gratziani, Netzach; Biran, A.

doi:10.1016/0925-4005(93)80007-x

Cited by 20 publications

(16 citation statements)

References 6 publications

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“…SAW Module and Exposure System. SAW delay-line narrow-band filters operating at 104 MHz were similar to those described previously. − The devices were mounted in standard dual-in-line microelectronic packages, and wire-bonded to the input and output pins. The oscillator electronics included an rf amplifier and a 6 dB coupler that separated the output load from the feedback circuit and minimized frequency-pulling effects.…”

Section: Methodsmentioning

confidence: 99%

The Polymer-Coated SAW Sensor as a Gravimetric Sensor

et al. 1997

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The absorption and desorption of chlorobenzene, odichlorobenzene, and chloroform in poly[n-butyl methacrylate] (PBMA) was studied in polymer-coated 104 MHz surface acoustic wave (SAW) sensors, and in freestanding polymer films by thermogravimetric analysis (TGA). The sorption processes were analyzed by a Fickian simulation and best-fit partition, and diffusion coefficients were derived. Good correlations were found between simulated and observed data. Partition coefficients derived from SAW response were independent of coating thickness and were found to be about two to three times bigger than those derived from the gravimetric response. In contrast, the diffusion coefficients increased linearly with coating thickness in the range 70-560 kHz. For the thickest polymer coating, SAW-derived diffusion coefficients were comparable with TGA-related diffusion coefficients. This study reconfirms the finding for other polymers that the response of SAW chemosensors is higher than that anticipated from a mass change only. The viscoelastic effect is again more pronounced than the gravimetric effect. Moreover, the similarity of diffusion coefficients obtained at higher polymer thicknesses suggests that the rate of change of the SAW viscoelastic component is similar to that of the gravimetric element. It is fair to assume that both processes originate from the same event: the absorption of the analyte in the polymer. In this view the polymer-coated SAW sensor may be regarded as an enhanced gravimetric sensor.

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Section: Methodsmentioning

confidence: 99%

The Polymer-Coated SAW Sensor as a Gravimetric Sensor

et al. 1997

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“…6. Of course the loading mass and the type of piezoelectric substrate affect the relation between the frequency shift and the temperature [8,9]. Our measurement results show that for the investigated range of parameters the 3-PcCu layer provides several times better temperature stability of SAW delay line generation frequency (hence also the stability of differential frequency) than a-PcCu layer ofthe same mass.…”

Section: The Sensitive Filmmentioning

confidence: 85%

<title>SAW NO<formula><inf><roman>2</roman></inf></formula> sensors employing copper phthalocyanine as the chemical interface</title>

Hechner

Wróbel

1997

Optoelectronic and Electronic Sensors II

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This paper presents some problems concerned with SAW NO2 sensors employing copper phthalocyanine (PcCu) as the chemical interface. The influence of piezoelectric substrate material, crystalline structure and geometry of the PcCu coatings on the sensor sensitivity, and on temperature stability of generated frequency is discussed.The experiments were carried out for SAW delay lines on STX quartz and 128°YX lithium niobate. Our measurements concerned PcCu coating of a and 13 structure. We varied the coating layer thickness from 0. ljtm tol.5tm and its density from O.l7gIcm3 to 1.6g/cm3. it was found that for the investigated range of parameters the -PcCu layer provides several times better sensor sensitivity and temperature stability of SAW delay line generation frequency than cx-PcCu layer of the some mass. This is valid for both used substrates.

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“…Gas-liquid chromatograph (GLC) studies have shown that the temperature dependence of K (partition coefficient) at low vapor concentration over nite temperature ranges can be described by the Arrhenius-type relationship. 32,33…”

Section: Temperature Effect On Sensor Responsementioning

confidence: 99%