Reflectance Infrared Spectroscopy on Operating Surface Acoustic Wave Chemical Sensors during Exposure to Gas-Phase Analytes
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Abstract
Instrumentation, software, and a specialized device were developed to combine surface acoustic wave (SAW) sensor measurements with direct, in situ Fourier transform infrared external-reflectance spectroscopy (FT-IR-ERS). Probing surface-confined sensing films with molecularly specific IR spectroscopy during analyte exposure characterizes in unprecedented detail the interactions between sorptive SAW coatings and gaseous analytes. The unique device and measurement system are described. The power of the combined measurements is demonstrated by SAW/FT-IR-ERS responses to several organic analytes interacting with a conventional organic polymer, a transition-metal-coordinating self-assembled alkanethiol monolayer, and a “molecular cage” film based on a cyclodextrin.
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