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Guest‐tunable dielectric sensing using a single crystal of HKUST‐1

DOI: 10.1002/admi.202000408 DOI Help

Authors: Arun S. Babal (University of Oxford) , Abhijeet K. Chaudhari (University of Oxford) , Hamish H.-M. Yeung (University of Oxford; University of Birmingham) , Jin-Chong Tan (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Advanced Materials Interfaces , VOL 7

State: Published (Approved)
Published: July 2020

Open Access Open Access

Abstract: There is rising interest on low‐k dielectric materials based on porous metal–organic frameworks (MOFs) for improved electrical insulation in microelectronics. Herein, the concept of MOF dielectric sensor built from a single crystal of HKUST‐1 is demonstrated. Guest encapsulation effects of polar and non‐polar molecules are studied, by monitoring the transient dielectric response and AC conductivity of the crystal exposed to different vapors (water, iodine, methanol, and ethanol). The dielectric properties are measured along the <100> crystal direction in the frequency range of 100 Hz to 2 MHz. The dielectric data show the efficacy of MOF dielectric sensor for discriminating the guest analytes. The time‐dependent transient response reveals dynamics of the molecular inclusion and exclusion processes in the nanoscale pores. Since dielectric response is ubiquitous to all MOF materials (unlike DC conductivity and fluorescence), the results demonstrate the potential of dielectric MOF sensors compared to resistive sensors and luminescence‐based approaches.

Journal Keywords: conductivity; dielectrics; host–guest interaction; metal–organic frameworks; single crystal

Subject Areas: Materials, Physics

Instruments: B22-Multimode InfraRed imaging And Microspectroscopy

Added On: 20/04/2021 10:20


Discipline Tags:

Physics Electronics Chemistry Materials Science Metal-Organic Frameworks Metallurgy Organometallic Chemistry

Technical Tags:

Spectroscopy Raman Spectroscopy