By C. Lu, A.W. Czanderna
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Extra resources for Applications of Piezoelectric Quartz Crystal Microbalances
5 mg/cm 2 onto a QCM in his experiments. 94 x 104 kg/m 3 ) for gold films. As the mass of deposited material becomes appreciable and forms a uniform layer of finite thickness, the assumption that acoustic waves do not propagate in the film becomes less accept able. In an effort to rectify the difficulties, Miller and Bolef  took a different approach and treated the quartz film combination as a composite acoustic resonator. The deposited film is considered as an integral part of the vibrating system.
The increase in crystal resistance results in a decrease of Q. When the Q factor of the mass sensing crystal becomes sufficiently low, the oscillator circuit can no longer sustain the oscillation, and the QCM ceases to function. 56 C. LU C. Quartz Crystal Microbalances for Special Environments The crystal holder shown in Fig. 17 is suitable for near room temperature operation. If external thermal input to the mass sensing crystal is properly controlled, its temperature will not be much different from that of the water-cooled crystal holder.
Because a supporting structure is needed to hold the quartz crystal resonator, the vibration must be limited to an area which is away from the physical contact points to avoid any of the damping oscillations. For a circular quartz plate, the most convenient support is around its circumference because the vibration needs to be localized at the center of the plate. This is typically accom plished by any one or a combination of the following methods: contouring one or both surfaces with convex geometry; beveling the edge; or limiting the electrode size.
Applications of Piezoelectric Quartz Crystal Microbalances by C. Lu, A.W. Czanderna