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Quartz crystal microbalance setup for frequency and Q-factor measurements in gaseous and liquid environments

Rodahl, Michael, Höök, Fredrik, Krozer, Anatol, Brzezinski, Peter, Kasemo, Bengt·1995·Review of Scientific Instruments

Abstract

An experimental setup has been constructed for simultaneous measurements of the frequency, the absolute Q factor, and the amplitude of oscillation of a quartz crystal microbalance (QCM). The technical solution allows operation in vacuum, air, or liquid. The crystal is driven at its resonant frequency by an oscillator that can be intermittently disconnected causing the crystal oscillation amplitude to decay exponentially. From the recorded decay curve the absolute Q factor (calculated from the decay time constant), the frequency of the freely oscillating crystal, and the amplitude of oscillation are obtained. All measurements are fully automated. One electrode of the QCM in our setup was connected to true ground which makes possible simultaneous electrochemistry. The performance is illustrated by experiments in fluids of varying viscosity (gas and liquid) and by protein adsorption in situ. We found, in addition to the above results, that the amplitude of oscillation is not always directly proportional to the Q factor, as the commonly used theory states. This puts limitations on the customary use of the amplitude of oscillation as a measure of the Q factor.

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Metadata

Authors
Rodahl, M., Höök, F., Krozer, A., Brzezinski, P., & Kasemo, B.
Venue
Review of Scientific Instruments
Published
1995-07-01
Volume
66
Issue
7
Pages
3924-3930
ISSN
  • 0034-6748 (ISSN-L)
  • 1089-7623
OpenAlex
W1970004609
Cited by
1,296
References
0
FWCI
8.86
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Quartz crystal microbalance setup for frequency and Q-factor measurements in gaseous and liquid environments. https://app.cochat.ai/papers/10.1063/1.1145396
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Rodahl, M., Höök, F., Krozer, A., Brzezinski, P., & Kasemo, B. (1995). Quartz crystal microbalance setup for frequency and Q-factor measurements in gaseous and liquid environments. Review of Scientific Instruments. https://doi.org/10.1063/1.1145396

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