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Title: Direct Electrical Detection of Iodine Gas by a Novel Metal–Organic-Framework-Based Sensor

Journal Article · · ACS Applied Materials and Interfaces

High-fidelity detection of iodine species is of utmost importance to the safety of the population in cases of nuclear accidents or advanced nuclear fuel reprocessing. In this paper, we describe the success at using impedance spectroscopy to directly detect the real-time adsorption of I2 by a metal–organic framework zeolitic imidazolate framework (ZIF)-8-based sensor. Methanolic suspensions of ZIF-8 were dropcast onto platinum interdigitated electrodes, dried, and exposed to gaseous I2 at 25, 40, or 70 °C. Using an unoptimized sensor geometry, I2 was readily detected at 25 °C in air within 720 s of exposure. The specific response is attributed to the chemical selectivity of the ZIF-8 toward I2. Furthermore, equivalent circuit modeling of the impedance data indicates a >105× decrease in ZIF-8 resistance when 116 wt % I2 is adsorbed by ZIF-8 at 70 °C in air. This irreversible decrease in resistance is accompanied by an irreversible loss in the long-range crystallinity, as evidenced by X-ray diffraction and infrared spectroscopy. Air, argon, methanol, and water were found to produce minimal changes in ZIF-8 impedance. Finally, this report demonstrates how selective I2 adsorption by ZIF-8 can be leveraged to create a highly selective sensor using >105× changes in impedance response to enable the direct electrical detection of environmentally relevant gaseous toxins.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000; NA0003525
OSTI ID:
1429678
Report Number(s):
SAND2017-12024J; 658480; TRN: US1802742
Journal Information:
ACS Applied Materials and Interfaces, Vol. 9, Issue 51; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 61 works
Citation information provided by
Web of Science

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Cited By (5)

IL-induced formation of dynamic complex iodide anions in IL@MOF composites for efficient iodine capture journal January 2019
Fluorescent conjugated mesoporous polymers with N , N -diethylpropylamine for the efficient capture and real-time detection of volatile iodine journal January 2020
Versatile bimetallic lanthanide metal-organic frameworks for tunable emission and efficient fluorescence sensing journal April 2018
Reversible MOF-Based Sensors for the Electrical Detection of Iodine Gas journal July 2019
Guest-Tunable Dielectric Sensing Using a Single Crystal of HKUST-1 preprint January 2020

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