There exists a significant need for low-cost, lightweight, and robust point detection of hazardous and toxic gas phase molecules. Metal-organic frameworks (MOFs) are attractive to serve as the sensing layer in gas sensors because they are highly porous materials with large internal surface areas. In this study, a MOF/ polyvinylpyrrolidone film was sprayed onto interdigitated electrodes using an aerosol deposition technique. The sprayed films were characterized by optical and scanning electron microscopy. The electrical behavior of the sensor was measured by frequency-dependent impedance spectroscopy during exposure to nitrobenzene vapor, which served as a model explosive compound. These studies indicate that at frequencies below 1 kHz, the impedance decreases in proportion to the amount of nitrobenzene absorbed into the film. The sensor can be regenerated by heating the film and reused without loss of performance.

Fabrication and evaluation of metal-organic framework/polymer thin film gas sensors

255th National Meeting (2018)

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