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    • 4. 发明申请
    • PIEZOELECTRIC CANTILEVER SENSORS
    • 压电式CANTILEVER传感器
    • WO2005043126A3
    • 2005-08-04
    • PCT/US2004036705
    • 2004-10-27
    • UNIV DREXELSHIH WAN YSHIH WEI-HENGSHEN ZUYAN
    • SHIH WAN YSHIH WEI-HENGSHEN ZUYAN
    • G01N20060101G01N1/00G01N29/02G01N29/036
    • G01N29/022G01N5/02G01N29/036G01N2291/0255G01N2291/0256G01N2291/02818G01N2291/0422G01N2291/0426G01N2291/0427
    • A piezoelectric cantilever with a non-piezoelectric, or piezoelectric tip useful as mass and viscosity sensors. The change in the cantilever mass can be accurately quantified by monitoring a resonance frequency shift of the cantilever. For bio-detection, antibodies or other specific receptors of target antigens may be immobilized on the cantilever surface, preferably on the non-piezoelectric tip. For chemical detection, high surface-area selective absorbent materials are coated on the cantilever tip. Binding of the target antigens or analytes to the cantilever surface increases the cantilever mass. Detection of target antigens or analytes is achieved by monitoring the cantilever's resonance frequency and determining the resonance frequency shift that is due to the mass of the adsorbed target antigens on the cantilever surface. The use of a piezoelectric unimorph cantilever allows both electrical actuation and electrical sensing. Incorporating a non-piezoelectric tip (14) enhances the sensitivity of the sensor. In addition, the piezoelectric cantilever can withstand damping in highly viscous liquids and can be used as a viscosity sensor in wide viscosity range.
    • 具有非压电或压电尖端的压电悬臂,可用作质量和粘度传感器。 通过监测悬臂的共振频率偏移可以准确量化悬臂质量的变化。 为了生物检测,靶抗原的抗体或其他特异性受体可以固定在悬臂表面上,优选地固定在非压电尖端上。 对于化学检测,高表面积选择性吸收材料涂覆在悬臂尖端。 目标抗原或分析物与悬臂表面的结合增加了悬臂质量。 通过监测悬臂的共振频率并确定由于悬臂表面上吸附的靶抗原的质量而引起的共振频移,实现了靶抗原或分析物的检测。 使用压电单块悬臂可以实现电致动和电感测。 结合非压电尖端(14)增强了传感器的灵敏度。 此外,压电悬臂可以承受高粘度液体中的阻尼,可用作宽粘度范围内的粘度传感器。