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    • 1. 发明授权
    • Chemical sensor and coating for same
    • 化学传感器和涂层相同
    • US06237397B1
    • 2001-05-29
    • US09413628
    • 1999-10-06
    • Ruth ShinarGuojun LiuMarc D. Porter
    • Ruth ShinarGuojun LiuMarc D. Porter
    • G01N2902
    • G01N29/022G01N2291/014G01N2291/0256G01N2291/02863G01N2291/0423G01N2291/0426G01N2291/0427
    • An acoustic wave based-chemical sensor containing a crystal substrate and a coating of small particulate matter is disclosed. The small particulate matter can be graphite particles. Transducers are connected to the crystal substrate to generate an alternating potential across the crystal substrate, which in turn causes the crystal to resonate due to the converse piezoelectric effect. The coating absorbs the analyte, thus changing the mass of the sensor, and accordingly changing its resonant frequency. The transducers detect this change in resonant frequency to indicate that the analyte is present. The use of small particulate matter results in a coating having a large surface area which facilitates mass uptake of large amounts of VOCs, improved acoustic properties even with relatively thick coatings, and a high operational temperature range.
    • 公开了一种包含晶体衬底和小颗粒物质涂层的基于声波的化学传感器。 小颗粒物可以是石墨颗粒。 传感器连接到晶体衬底以在晶体衬底之间产生交替电位,这又导致晶体由于相反的压电效应而谐振。 涂层吸收分析物,从而改变传感器的质量,从而改变其共振频率。 传感器检测谐振频率的这种变化,以表明分析物存在。 使用小的颗粒物质可形成具有大表面积的涂层,其有利于大量挥发性有机物的吸收,甚至在相对较厚的涂层和较高的操作温度范围内也改善了声学性能。
    • 2. 发明授权
    • Chemical sensor and coating for same
    • 化学传感器和涂层相同
    • US06432362B1
    • 2002-08-13
    • US09413401
    • 1999-10-06
    • Ruth ShinarGuojun LiuMarc D. Porter
    • Ruth ShinarGuojun LiuMarc D. Porter
    • G01N2700
    • G01N29/022G01N2291/014G01N2291/0212G01N2291/0222G01N2291/0256G01N2291/0423G01N2291/0426G01N2291/0427
    • An acoustic wave based-chemical sensor utilizing a crystal substrate and a coating of at least two blended materials is disclosed. The blended materials comprise a combination of (a) a high glass transition temperature polymer or a material of high melting point, and (b) a low glass transition temperature polymer or a material having a low melting point. Transducers are connected to the crystal substrate to generate an alternating potential across the crystal substrate, which in turn causes the crystal to resonate due to the converse piezoelectric effect. The blended coating absorbs the analyte, thus changing the mass of the chemical sensor, and accordingly changing its resonant frequency. The transducers detect this change in resonant frequency to indicate that the analyte is present. The use of blended materials results in a thicker coating combining the preferred properties of the blend constituents, such as improved detection sensitivities, faster response times, less acoustic wave damping, and higher operational temperature ranges.
    • 公开了一种使用晶体基底的基于声波的化学传感器和至少两种混合材料的涂层。 混合材料包括(a)高玻璃化转变温度聚合物或高熔点材料的组合,和(b)低玻璃化转变温度聚合物或具有低熔点的材料。 传感器连接到晶体衬底以在晶体衬底之间产生交替电位,这又导致晶体由于相反的压电效应而谐振。 混合涂层吸收分析物,从而改变化学传感器的质量,从而改变其共振频率。 传感器检测谐振频率的这种变化,以表明分析物存在。 混合材料的使用导致较厚的涂层结合混合物组分的优选性能,例如改进的检测灵敏度,更快的响应时间,更少的声波阻尼和更高的操作温度范围。