Quartz crystal resonators （QCRs） with circular electrodes have been widely used for various liquid and gas sensing applications. In this work, quartz crystal resonators with elliptical electrodes were studied and te...Quartz crystal resonators （QCRs） with circular electrodes have been widely used for various liquid and gas sensing applications. In this work, quartz crystal resonators with elliptical electrodes were studied and tested for liquid property measurement. Mindlin＇s theory was used to optimize the dimension and geometry of the electrodes and a 5-MHz QCR with minimum series resistance and without any spurious modes was obtained. A series of AT-cut QCRs with elliptical electrodes of different sizes were fabricated and their sensing performances were compared to devices with circular electrodes. The experimental result shows that the device with elliptical electrodes can obtain lower resonance impedance and a higher Q factor, which results in a better loading capability. Even though the sensitivities of devices with elliptical and circular electrodes are found to be similar, the sensor with elliptical electrodes has much higher resolution due to a better frequency stability. The study indicates that the performance of QCRs with elliptical electrodes is superior to that of traditional QCRs with circular electrodes.展开更多
以质量分数0.3的In2O3掺杂Zn O电极材料作为敏感电极,Pt为参比电极,在1 200℃下烧结制备了（Zn O＋质量分数0.3的In2O3）/YSZ/Pt结构的CO传感器。保持O2的体积分数为5%不变,在450℃-550℃下测试其对浓度为2×10^-4的CO气体的响应。...以质量分数0.3的In2O3掺杂Zn O电极材料作为敏感电极,Pt为参比电极,在1 200℃下烧结制备了（Zn O＋质量分数0.3的In2O3）/YSZ/Pt结构的CO传感器。保持O2的体积分数为5%不变,在450℃-550℃下测试其对浓度为2×10^-4的CO气体的响应。实验表明,工作温度为500℃时,传感器的响应值达到最大（-59 m V）,接近未掺杂之前的两倍,使得传感器的灵敏度得到极大极高。为了克服C3H6气体的干扰（响应值在-50 m V以上）,借鉴混合电位理论,用柱状形貌Cr2O3材料替代Pt做参比电极制备了抵偿型CO传感器,并测试其敏感性能。结果表明,该传感器对CO的响应值只减小了-11 m V（为-48 m V）,而对C3H6的响应则呈现出大幅度衰减（-10 m V以下）,明显提高了传感器的选择性。最后,对此现象,我们采用相应的传感器敏感机理进行了探讨。展开更多
基金supported by the National Natural Science Foundation of China (Grant No.60571014)
文摘Quartz crystal resonators （QCRs） with circular electrodes have been widely used for various liquid and gas sensing applications. In this work, quartz crystal resonators with elliptical electrodes were studied and tested for liquid property measurement. Mindlin＇s theory was used to optimize the dimension and geometry of the electrodes and a 5-MHz QCR with minimum series resistance and without any spurious modes was obtained. A series of AT-cut QCRs with elliptical electrodes of different sizes were fabricated and their sensing performances were compared to devices with circular electrodes. The experimental result shows that the device with elliptical electrodes can obtain lower resonance impedance and a higher Q factor, which results in a better loading capability. Even though the sensitivities of devices with elliptical and circular electrodes are found to be similar, the sensor with elliptical electrodes has much higher resolution due to a better frequency stability. The study indicates that the performance of QCRs with elliptical electrodes is superior to that of traditional QCRs with circular electrodes.
文摘为提高CO传感器的灵敏度,采用丝网印刷技术制备了一系列以钇稳定氧化锆为固体电解质、以Zn O材料中掺杂不同比例的In2O3为敏感电极、以Pt为参比电极的片式结构电位型CO传感器,并于特定的工作条件下测试其对不同气体组分的响应性能.结果表明,当掺杂比例为质量分数0.3,烧结温度为1 200℃且工作温度为500℃时,传感器对CO气体的响应值最大,达到-59 m V,接近未掺杂前的2倍,传感器的灵敏度有很大提高.并为阐述传感器的敏感机理,开展了相应的材料结构表征(XRD/SEM)和电化学催化活性(阻抗谱)测试研究.
文摘以质量分数0.3的In2O3掺杂Zn O电极材料作为敏感电极,Pt为参比电极,在1 200℃下烧结制备了（Zn O＋质量分数0.3的In2O3）/YSZ/Pt结构的CO传感器。保持O2的体积分数为5%不变,在450℃-550℃下测试其对浓度为2×10^-4的CO气体的响应。实验表明,工作温度为500℃时,传感器的响应值达到最大（-59 m V）,接近未掺杂之前的两倍,使得传感器的灵敏度得到极大极高。为了克服C3H6气体的干扰（响应值在-50 m V以上）,借鉴混合电位理论,用柱状形貌Cr2O3材料替代Pt做参比电极制备了抵偿型CO传感器,并测试其敏感性能。结果表明,该传感器对CO的响应值只减小了-11 m V（为-48 m V）,而对C3H6的响应则呈现出大幅度衰减（-10 m V以下）,明显提高了传感器的选择性。最后,对此现象,我们采用相应的传感器敏感机理进行了探讨。
