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首页> 外文会议>Symposium on Nondestructive Characterization of Materials in Aging Systems, held November 30- December 4, 1997, Boston, Massachusetts, U.S.A. >Expoxy cure monitoring with an interdigitated gate electrode field effect transistor (IGEFET)
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Expoxy cure monitoring with an interdigitated gate electrode field effect transistor (IGEFET)

机译：使用叉指式栅电极场效应晶体管（ISFET）进行环氧固化监控

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摘要

An interdigitated gate electrode field-effect transistor (IGEFET) was designed, fabricated and used to monitor the cure of a common epoxy. The IGEFET sensor consists of an interdigitated gate electrode structure which is coupled to the gate contact of a conventional metal-oxide-semi-conductor field-efffect transistor (MOSFET). The epoxy was deposited on the interdigitated gate electrode, and the IGEFET's electrical performance was observed as the epoxy cured. The cross-linking chemical reaction during epoxy cure caused electrical impedance changes that were quantified when the IGEFET was operated with a periodic voltage pulse signal. Charge transferred through the chemically-active epoxy is manifested as a temporally-dependent potential applied to the MOSFET's gate contact. By operating the MOSFET as a linear amplifier, a potential corresponding to the temporally-dependent gate voltage was directly measured at the amplifier's output. The Fourier transform of the IGEFET's time-domain response at specific time increments was computed. The resulting epoxy cure spectra were compared to a reproducible baseline spectrum, and an ensemble of difference spectra were computed to reveal the epoxy's chemical state at specific instances of time. The difference spectra features yield valuable information concerning the state of the epoxy's cure.
机译：设计，制造并使用了叉指式栅电极场效应晶体管（IGEFET）来监控普通环氧树脂的固化。 IGEFET传感器由一个叉指式栅电极结构组成，该结构与传统的金属氧化物半导体场效应晶体管（MOSFET）的栅极触点相连。环氧树脂沉积在叉指栅电极上，随着环氧树脂固化，观察到IGEFET的电性能。环氧固化过程中的交联化学反应引起电阻抗变化，当使用周期性电压脉冲信号操作IGEFET时，可以量化该电阻抗变化。通过化学活性环氧树脂转移的电荷表现为施加到MOSFET栅极触点的随时间变化的电位。通过将MOSFET作为线性放大器工作，可以在放大器的输出端直接测量与随时间变化的栅极电压相对应的电势。计算了在特定时间增量处IGEFET的时域响应的傅立叶变换。将所得的环氧树脂固化光谱与可重现的基线光谱进行比较，并计算出一组差异光谱，以揭示特定时间点上环氧树脂的化学状态。差异光谱特征产生有关环氧树脂固化状态的有价值的信息。

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