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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Study of viscoelastic effect on the frequency shift of microcantilever chemical sensors
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Study of viscoelastic effect on the frequency shift of microcantilever chemical sensors

机译：粘弹性对微悬臂梁化学传感器频率漂移影响的研究

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摘要

Microcantilevers coated with a chemically sensitive layer are increasingly being used in chemical detection systems. The sensitive coating, often a polymer, absorbs specific molecules, which can be detected by monitoring the shift in the mechanical resonant frequency. Usually. the frequency shift resulting from molecular absorption is interpreted as a mass loading effect. However, mass loading is not the only effect that has an impact on the frequency shift; the viscoelastic properties of the sensitive coating also are affected by the sorption process. Sorption-induced modulus changes are typically difficult to characterize. However, it is known that the sorption of analyte molecules in a polymer coating results in the plasticization of the coating. In most cases, the polymer becomes more rubbery with increasing concentration of analyte molecules, i.e., the coating becomes softer with increasing loss modulus, and the storage modulus decreases. Using a new analytical model developed for the resonant frequency expression of a hybrid microcantilever (elastic base and viscoelastic layer), the effects of the modification of the storage and loss moduli of the sensitive layer on the resonant frequency are examined. The main conclusion of this analytical study is that, even if the sensitive coating moduli are small compared to the base cantilever's Young's modulus, the effect of the change in the viscoelastic coating properties could contribute significantly to the overall frequency shift (8-23% in the simulations depending on the coating thickness, with even higher contributions for other sets of problem parameters)
机译：涂有化学敏感层的微悬臂越来越多地用于化学检测系统。敏感的涂层（通常是聚合物）吸收特定的分子，可以通过监测机械共振频率的变化来检测这些分子。通常。分子吸收引起的频移被解释为质量负载效应。但是，负载并不是影响频移的唯一效果；敏感涂层的粘弹性还受吸附过程的影响。吸附引起的模量变化通常难以表征。但是，已知聚合物涂层中分析物分子的吸附导致涂层的增塑。在大多数情况下，随着分析物分子浓度的增加，聚合物变得更有橡胶性，即，随着损耗模量的增加，涂层变得更软，并且储能模量降低。使用为混合微悬臂梁（弹性基础层和粘弹性层）的共振频率表达式开发的新分析模型，检查了敏感层的存储和损耗模量的修改对共振频率的影响。该分析研究的主要结论是，即使与基础悬臂梁的杨氏模量相比，敏感的涂层模量较小，粘弹性涂层性能变化的影响也可显着影响整体频率偏移（在8-23％模拟取决于涂层的厚度，对其他问题参数的贡献更大

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