Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations

Small, Leo J.; Krumhansl, James L.; Rademacher, David X.; Nenoff, Tina M.

doi:10.1016/j.micromeso.2019.01.051

Title: Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations

Journal Article · Thu Jan 31 00:00:00 EST 2019 · Microporous and Mesoporous Materials

DOI:https://doi.org/10.1016/j.micromeso.2019.01.051· OSTI ID:1498490

Small, Leo J. ^[1]; Krumhansl, James L. ^[1]; Rademacher, David X. ^[1];

^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Detection of radiological iodine gas after nuclear accidents or in nuclear fuel reprocessing is necessary for the safety of human life and the environment. The development of sensors for the detection of iodine benefits from the incorporation of nanoporous materials with high selectivity for I₂ from common competing gases in air. Silver mordenite zeolite (Ag-MOR) is widely-used material for capture of gaseous iodine (I₂). In this paper, thin film zeolite coatings were applied to Pt interdigitated electrodes (IEDs) to fabricate iodine gas sensors with direct electrical readout responses. Correlations between occluded ion, exposure to iodine gas, resultant AgI nanoparticle polymorphs and location in zeolite with resultant impedance spectroscopy (IS) properties are described. Furthermore, IS is leveraged to elucidate the changes in charge conduction pathways as determined by the cation-zeolite film incorporated in the sensor. Silver mordenite reveals a significant change in impedance upon exposure to gaseous I₂ at 70 °C, and the magnitude and direction of the response is dependent on whether the Ag⁺-mordenite is reduced (Ag⁰) before I₂ exposure. An equivalent circuit model is developed to describe the movement of charge along the surface and through the pores of the mordenite grains. Relative changes in the impedance of these conduction pathways are related to the chemical changes from Ag⁺ or Ag⁰ to resultant AgI polymorph phase. Lastly, together, these results inform design of a compact Ag-mordenite sensor for direct electrical detection of gaseous I₂.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Understanding and Control of Acid Gas-induced Evolution of Materials for Energy (UNCAGE-ME); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; SC0012577; NA0003525

OSTI ID:: 1498490

Alternate ID(s):: OSTI ID: 1637071

Report Number(s):: SAND-2018-13329J; 670302

Journal Information:: Microporous and Mesoporous Materials, Vol. 280, Issue C; ISSN 1387-1811

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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A Solvent Free Approach for the Preparation of Silver Modified Mesoporous Silica for Iodine Entrapment Moloney, Mícheál P.; Massoni, Nicolas; Egodawatte, Shani Journal of Inorganic and Organometallic Polymers and Materials, Vol. 30, Issue 7 https://doi.org/10.1007/s10904-020-01447-3	journal	January 2020
Reversible MOF-Based Sensors for the Electrical Detection of Iodine Gas Small, Leo J.; Hill, Ryan C.; Krumhansl, James L. ACS Applied Materials & Interfaces, Vol. 11, Issue 31 https://doi.org/10.1021/acsami.9b09938	journal	July 2019

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