Gravimetric and non-gravimetric chemical quartz crystal resonators

Lücklum, Ralf; Behling, C.; Hauptmann, P.

doi:10.1016/s0925-4005(99)00311-1

Cited by 66 publications

(53 citation statements)

References 12 publications

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“…This finding is not surprising in view of viscoelastic properties of RTIL coatings, whose rheology causes energy dissipation with concomitant attenuation of QCM oscillations. [46][47][48][49] Consequently, the mass increase (frequency decrease) expected for the transient trapping of analytes in the RTIL film is accompanied by a change of viscoelastic effects (frequency increase) which frequently prevails when liquid or liquid-like films are involved. 49 Oscillation frequency for all RTIL coated quartz crystals changed linearly with the ethyl acetate amount injected, but only until it did not exceed 10 µmol, since higher amounts led always to a downward tendency (see Figure S2, Supporting Information).…”

Section: Main Features Of Qcm Measurements At Rtil Coated Quartz Crysmentioning

confidence: 99%

Room Temperature Ionic Liquids As Useful Overlayers for Estimating Food Quality from Their Odor Analysis by Quartz Crystal Microbalance Measurements

et al. 2013

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An array of quartz crystals coated with different room-temperature ionic liquids (RTILs) is proposed for the analysis of flavors by quartz crystal microbalance (QCM) measurements. Seven RTILs were adopted as sensing layers, all containing imidazolium or phosphonium cations, differing from one another in the length and branching of alkyl groups and neutralized by different anions. The array was at first applied to the analysis of 31 volatile organic compounds (VOCs), such as alcohols, phenols, aldehydes, esters, ketones, acids, amines, hydrocarbons and terpenes, chosen as representative components of a wide variety of food flavors. Multivariate data analysis by the principal component analysis (PCA) approach of the set of the corresponding responses led to separated clusters for these different chemical categories. To further prove the good performance of the RTIL-coated quartz crystal array as an "electronic nose", it was applied to the analysis of headspaces from cinnamon samples belonging to different botanical varieties (Cinnamon zeylanicum and Cinnamon cassia). PCA applied to responses recorded on different stocks of samples of both varieties showed that they could be fully discriminated.

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Section: Main Features Of Qcm Measurements At Rtil Coated Quartz Crysmentioning

confidence: 99%

Room Temperature Ionic Liquids As Useful Overlayers for Estimating Food Quality from Their Odor Analysis by Quartz Crystal Microbalance Measurements

et al. 2013

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“…When the sensing film is rigid and acoustically thin, then the sensor response can be related directly to mass accumulation of the measurand at the interface [80], [96]. Examples include gas absorption by thin rigid polymer films [83] and thin metal oxide films [97], or some immunological reactions [98]. However, when the film is acoustically thick then, in addition to mass effects, the film viscous and elastic properties make significant contributions to the sensor response and the relationship between the sensor response and molecular events could be very complex [80], [99], [100].…”

Section: ) Acoustic Waves Piezoelectric Transducers and Acoustic Sementioning

confidence: 99%

Emerging biomedical sensing technologies and their applications

2003

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Abstract-Recent progress in biomedical sensing technologies has resulted in the development of several novel sensor products and new applications. Modern biomedical sensors developed with advanced microfabrication and signal processing techniques are becoming inexpensive, accurate, and reliable. A broad range of sensing mechanisms has significantly increased the number of possible target measurands that can be detected. The miniaturization of classical "bulky" measurement techniques has led to the realization of complex analytical systems, including such sensors as the BioChemLab-on-a-Chip. This rapid progress in miniature devices and instrumentation development will significantly impact the practice of medical care as well as future advances in the biomedical industry. Currently, electrochemical, optical, and acoustic wave sensing technologies have emerged as some of the most promising biomedical sensor technologies. In this paper, important features of these technologies, along with new developments and some of the applications, are presented.

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“…The surface acoustic wave devices are capable of detecting mass changes in the range of several nanograms [50,51]. They have been used to study the kinetics of monolayer adsorption and binding of molecules to SAMs [52,53].…”

Section: Non Electrochem Ical Techniquesmentioning

confidence: 99%