Abstract
The radial dependence of mass sensitivity of the sensing surface is analytically calculated for two examples of “modified-electrode” quartz crystal resonators (QCR). The term “modified-electrode” QCR is used here with respect to the conventional QCR which has two identical circular and concentric electrodes. For these QCRs, the sensing surface is divided into a fully electroded, a partially electroded, and an unelectroded region, and the efficiency of each region is evaluated in terms of the electrode mass loading factor. Such QCRs are typically investigated for sensor applications in which the electrical properties of the liquid load or the coating deposited on the sensing surface (electroded and partially electroded regions) are being measured in addition to mass loading. While modified-electrode QCRs can be viewed as a simple capacitance sensor in those applications, the use of a piezoelectric crystal resonator in the narrow range of frequencies near resonance and antiresonance allows for a direct meas...
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