Method for Estimating Polymer-Coated Acoustic Wave Vapor Sensor Responses

Grate, Jay W.; Patrash, Samuel J.; Abraham, Michael H.

doi:10.1021/ac00109a040

Cited by 127 publications

(143 citation statements)

References 40 publications

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“…Some of these, however, show ccselectivitiesy' correlated more strongly with key thermodynamic properties of the investigated analytes (saturation vapor pressure, for example), than with the presence of a demonstrated specific interaction or recognition process. Consequently, the general idea of molecular recognition in gas sensors was questioned recently by Grate et al [14].…”

Section: Introductionmentioning

confidence: 99%

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

et al. 1999

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Section: Introductionmentioning

confidence: 99%

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

et al. 1999

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“…Polymer detection estimate in ppm, calculated using: C,= Af&!Afsfrwp.)' Abraham et al, 1994 Grate et al, 1995) …”

Section: List Of Figuresmentioning

confidence: 99%

“…The polymer selection was based on the work of Grate et al (1995) and Abraham et al (1994) who characterized 14 polymers and developed a methodology for estimating the responses of polymer-coated SAW sensors to a wide range of vapor phase analytes. They describe how to use linear solvation energy relationships (LSERs) to model the sorption of vapors by polymer layers.…”

Section: Polymer Selectionmentioning

confidence: 99%

“…The equation used to calculate these estimated detection limits is Equation 7 in Grate et al (1995), but a coefficient of 2 was used rather than the coefficient of 4 as shown in the paper (personnel communication with Jay Grate, 2002). This calculation assumes a 500 MHz SAW device coated with a mass of polymer that shifts the frequency of the device by 1500 !dlz and a detection sensitivity of 50 Hz.…”

Section: Polymer Selectionmentioning

confidence: 99%

“…One is PIB, a commercially available polymer with reasonably low estimated detection limits for the targeted VOCs and the highest detection limit for water. The other polymer used was poly(ethy1ene vinyl acetate) (PEVA) which has been used with good success with the chemiresistor for monitoring these targeted VOCs but was not characterized by Grate et al (1995) and therefore does not appear in these tables. …”

Section: Polymer Selectionmentioning

confidence: 99%

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Field Demonstrations of Chemiresistor and Surface Acoustic Wave Microchemical Sensors at the Nevada Test Site

Ho¹,

Wright²,

McGrath³

et al. 2003

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Roof-shaped clathrate compounds as novel coating materials for the detection of organic solvent vapours: a study focussed on thickness shear mode resonators as mass-sensitive transducers

Reinbold

Cammann²,

Weber

et al. 1999

J. prakt. Chem.

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252The development of receptor-based chemical sensors for gas sensing, and in particular for monitoring volatile organic compounds (VOCs) is widely determined by the sensitive properties of the coating material. Therefore, the design and characterization of new chemically sensitive materials continues to be an active area of research [1,2]. Mass-sensitive devices such as the quartz microbalance (QMB) are versatile devices to study the sensor characteristics of different coating materials, such as polymers [3][4][5], supramolecular compounds for mono-[6 -9] and multimolecular inclusion [10 -12], thin self-assembled films [13], liquid crystals [14] or coordinating compounds [15].With reference to the QMB its main component is the piezoelectric quartz crystal as mass-sensitive transducer, usually a temperature compensated cut (AT) derived from a quartz single crystal, as it is mass-manufactured for electronic applications [16,17]. For gas sensing applications the quartz crystal is an external component of an oscillator circuit operating in its fundamental thickness shear mode at a frequency ranging from 1 MHz up to 30 MHz [18]. In view of their acous- Abstract. The performance of new crystalline inclusion hosts as chemical sensitive coatings for the detection of organic solvent vapours was investigated by using 10 MHz thickness shear mode resonators as mass-sensitive transducers. The crystalline host compounds under study consist of a characteristic 9,10-dihydro-9,10-ethanoanthracene framework with appended diarylmethanol clathratogenic groups 1, 2 or an analogous subunit 3. Relating to the selectivity of inclusion formation a database was generated consisting of the calibrated sensor responses from nine substituted versions of this host to each of seven organic solvent vapours (and humidity). From molecular shape, polarity and lipophilicity preferred inclusion selectivity was found for alcohol vapours, in particular for ethanol and methanol, thus tic wave propagation these transducers are denoted as thickness shear mode resonators (TSMR). Frequently used TSMRs operate at a resonant frequency of 10 MHz (quartz plate thickness 168 µm). Roof-Shaped Clathrate Compounds as Novel Coating Materials for the Detection of OrganicFirst theoretical investigations of mass-frequency relation was carried out by Sauerbrey, who derived a linear relationship between the frequency and small added masses onto the active area of the TSMR [19, 20]: with the frequency shift ∆f (in Hertz), and ∆m/A the surface mass loading in grams per square centimetre. The constant C is defined as the mass sensitivity or calibration constant and relates to the fundamental frequency f 0 in Hertz, and two material constants of the quartz crystal (density ρ = 2,650 g/cm 3 , share wave velocity u = 334 000 cm/s). The Sauerbrey equation is valid up to mass changes of 2% of the whole plate mass and the frequency shift, respectively.For the 10 MHz TSMRs used in this study (C = 2,26 10 8 cm 2 Hz -1 g -1 ; A = 0,25 cm 2 ) average shifts due indicating the pre...

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Method for Estimating Polymer-Coated Acoustic Wave Vapor Sensor Responses

Abstract: A method for estimating the responses of polymer-coated acoustic wave vapor sensors has been developed. Polymer/gas partition coefficients, determined experimentally

Cited by 127 publications

References 40 publications

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

Effective Use of Molecular Recognition in Gas Sensing: Results from Acoustic Wave and in Situ FT-IR Measurements

Field Demonstrations of Chemiresistor and Surface Acoustic Wave Microchemical Sensors at the Nevada Test Site

Roof-shaped clathrate compounds as novel coating materials for the detection of organic solvent vapours: a study focussed on thickness shear mode resonators as mass-sensitive transducers

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