Study of Subsurface Acoustic Waves for Liquid Chemical Microsensor Applications

需要能够在液体环境中运行并且能够检测诸如密度、粘度和分子组成变化的液体性质的可靠、快速、高性能的微传感器。微波声波技术为实现这类微传感器提供了最具吸引力的方法之一。由叉指换能器(IDT)激发的剪切水平波如Bleustein-Gulyaev(BG)波、表面掠过体波(SSBW)或平板模式适合于液体传感器的应用。本研究将对声波液相化学传感器进行深入的理论和实验研究。该分析将为实现一种新型的廉价、灵敏、快速的探测器提供设计方程。原型传感器将使用或不使用选择性的、灵敏度增强的薄膜涂层。将研究的各种化学体系包括溶解在水溶液中的晶体(C-6和C-12糖、多糖)、金属离子配位体、稀金属浓度和酸碱滴定。将对传感器的有效性进行完整的评估，如检测极限、灵敏度、重复性和响应时间。

There exists a need for dependable, rapid, high performance microsensors capable of performing in a liquid environment and capable of detecting change in liquid properties such as density, viscosity and change in molecular composition. Microwave acoustic wave technology offers one of the most attractive methods to realize these types of microsensors. Shear horizontal type waves excited by interdigital transducers (IDT) such as the Bleustein-Gulyaev (BG) wave, or the surface skimming bulk wave (SSBW) or plate modes appear suitable for liquid sensor applications. This research will include in-depth theoretical and experimental studies of acoustic wave liquid-phase-based chemical sensors. The analysis will provide design equations to realize a new class of inexpensive, sensitive and rapid detectors. Prototype sensors will be implemented with or without selective, sensitivity enhancement film coatings. The various chemical systems which will be studied include crystals (C-6 and C-12 sugars, polysaccharides) dissolved in aqueous solution, ligand with metal ion, dilute concentration of metal and acid/base titration. A complete evaluation of the sensor effectiveness such as detection limits, sensitivity, reproducibility and response time will be made.