Measurement of 5-Overtone Quality Factor of QCM Sensor with Asymmetric Ring Electrodes

The quartz crystal microbalance (QCM) sensor with asymmetric ring electrodes has received widespread attention for its uniform sensitivity distribution. At the same time, its 5-overtone mass sensitivity also greatly improves the fundamental frequency mass sensitivity. The 5-overtone quality (Q) factor is a technical indicator to measure the stable operation of the quartz crystal resonator with asymmetric ring electrodes in the fifth overtone mode. However, there are few papers to report the 5-overtone quality factor (Q5) of QCM sensor with asymmetric ring electrodes. Therefore, it is a crucial value to measure the 5-ovetone Q factor of the QCM sensor with asymmetric ring electrodes. In addition, the actual 5-overtone quality parameter Q5 is different to the nominal 5-overtone quality parameter Q’5. The experimental results show that all the actual 5-overtone quality factor values are larger than 88400. Hence, these results strongly support the QCM sensor with asymmetric ring electrodes to operate stably in the fifth overtone mode. This research work will inspire new applications of QCM sensors with asymmetric ring electrodes in the fifth overtone mode.