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Noise in quartz crystal microbalance

Noise in quartz crystal microbalance,10.1109/ICNF.2011.5994336,Petr Sedlak,Josef Sikula,Jiri Majzner,Martin Vrnata,Filip Vyslouzil,Premysl Fitl,Dusan

Noise in quartz crystal microbalance   (Citations: 1)
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There are several mechanisms that are related to fluctuation phenomena in QCM. The aim of our research is oriented to study the sensitivity and influence of different kind of noises on sensor resolution. Our experiments are provided on sensor with sorption layer of polypyrrole which is suitable for detection of water vapor. Based on these experiments, we suppose that /f noise caused by quartz internal friction and adoption- desorption (generation-recombination) noise from analyzed gas create the main components of measured noise spectral density. The value of the adoption-desorption noise depends on the physical and chemical parameters of analyzed gas and it is proportional to gas density. Adsorption-desorption kinetics is described by Kolmogorov equation and compared with Wolkenstein and Langmuir equations. Keywords-quartz crystal microbalance; Kolmogorov equations; adsorption-desorption noise; noise spectroscopy I. INTRODUCTION Quartz crystal microbalance (QCM) belongs to a group of high3sensitive sensors for detection of chemical substances dissolved in gas or liquid. This type of sensor is applied routinely by biologists and chemists to obtain information about chemical processes. The core of QCM is the AT3cut quartz crystal that oscillates at a resonant frequency which is determined by mass and geometry of the crystal mass as well as several other factors (temperature, applied voltage etc.). The section for the cut is chosen specially for the shear oscillations to possess the first3order zero temperature coefficient, which is necessary to provide thermal stability to the devices. The quartz electrodes are covered by sorption layers with affinity to the molecules of the detected matter. Sorbed matter (molecules of the detected mass) represents mass increment and the change of the viscoelastic properties of the layer, which leads to the change of resonant frequency. Thus, selectivity is given by the choice of the material of the sorption layer. At a resonance frequency of 10315 MHz, the sensitivity may reach 1 ng/cm
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