Optimized polymer-coated QCR for real-time, on-line detection of organic compounds in water

Menon, Ashok; Patel, Rupa; Zhou, R.; Josse, Fabien

doi:10.1109/freq.1998.717972

Cited by 3 publications

(1 citation statement)

References 14 publications

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“…At present, all of the methods of description of the oscillations in quartz may be divided into three groups. The first group uses the model of equivalent circuits, which represents a resonator as a branched oscillatory circuit for which the effect of distributed mass load on the changes in impedance is taken into account. − The second group uses various 2D and 3D models a priori to assign the distribution of displacements. , Finally, the third group of calculations of oscillations in quartz uses direct 3D modeling with the help of finite element modeling, − which allows one to take into account the effect of crystal anisotropy, the piezo effect, and the presence of metal electrodes on the resonator.…”

Section: Introductionmentioning

confidence: 99%

QCM Operating in Threshold Mode as a Gas Sensor

Dultsev

Kolosovsky

2009

Langmuir

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Application of the threshold mode allowed us to use the quartz resonator (quartz crystal microbalance, QCM) as a highly sensitive gas sensor measuring the forces of the rupture of adsorbed gas components from the resonator surface oscillating with increasing amplitude. This procedure allows one to analyze different gas components using the same surface modification, just varying the rupture threshold by varying the amplitude of shear oscillations. The sensitivity of the threshold measurements is 2 to 3 orders of magnitude higher than for the gravimetric procedure. It is demonstrated that the QCM operating as an active element can be used as a gas sensor. This procedure seems to be promising in investigating the reactivity of the surface or the interactions of gaseous components with the surface containing various functional groups, thus contributing to the surface chemistry.

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