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There is rising interest on low-k dielectric materials based on porousmetal-organic frameworks (MOFs) for improved electrical insulation inmicroelectronics. Herein, we demonstrate the concept of MOF dielectric sensorbuilt from a single crystal of HKUST-1. We study guest encapsulation effects ofpolar and non-polar molecules, by monitoring the transient dielectric responseand AC conductivity of the crystal exposed to different vapors (water, I2,methanol, ethanol). The dielectric properties were measured along the <100>crystal direction in the frequency range of 100 Hz to 2 MHz. The dielectricdata show the efficacy of MOF dielectric sensor for discriminating the guestanalytes. The time-dependent transient response reveals dynamics of themolecular inclusion and exclusion processes in the nanoscale pores. Sincedielectric response is ubiquitous to all MOF materials (unlike DC conductivityand fluorescence), our results demonstrate the potential of dielectric MOFsensors compared to resistive sensors and luminescence-based approaches.

Guest-Tunable Dielectric Sensing Using a Single Crystal of HKUST-1