Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations
Abstract
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 thesemore »
- Publication Date:
- Research Org.:
- 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 Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1498490
- Alternate Identifier(s):
- OSTI ID: 1637071
- Report Number(s):
- SAND-2018-13329J
Journal ID: ISSN 1387-1811; 670302
- Grant/Contract Number:
- AC04-94AL85000; SC0012577; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Microporous and Mesoporous Materials
- Additional Journal Information:
- Journal Volume: 280; Journal Issue: C; Journal ID: ISSN 1387-1811
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Zeolite; Mordenite; Iodine; Nanoporous; Impedance spectroscopy; Sensor
Citation Formats
Small, Leo J., Krumhansl, James L., Rademacher, David X., and Nenoff, Tina M. Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations. United States: N. p., 2019.
Web. doi:10.1016/j.micromeso.2019.01.051.
Small, Leo J., Krumhansl, James L., Rademacher, David X., & Nenoff, Tina M. Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations. United States. https://doi.org/10.1016/j.micromeso.2019.01.051
Small, Leo J., Krumhansl, James L., Rademacher, David X., and Nenoff, Tina M. Thu .
"Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations". United States. https://doi.org/10.1016/j.micromeso.2019.01.051. https://www.osti.gov/servlets/purl/1498490.
@article{osti_1498490,
title = {Iodine detection in Ag-mordenite based sensors: Charge conduction pathway determinations},
author = {Small, Leo J. and Krumhansl, James L. and Rademacher, David X. and Nenoff, Tina M.},
abstractNote = {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.},
doi = {10.1016/j.micromeso.2019.01.051},
journal = {Microporous and Mesoporous Materials},
number = C,
volume = 280,
place = {United States},
year = {Thu Jan 31 00:00:00 EST 2019},
month = {Thu Jan 31 00:00:00 EST 2019}
}
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Works referencing / citing this record:
A Solvent Free Approach for the Preparation of Silver Modified Mesoporous Silica for Iodine Entrapment
journal, January 2020
- Moloney, Mícheál P.; Massoni, Nicolas; Egodawatte, Shani
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Reversible MOF-Based Sensors for the Electrical Detection of Iodine Gas
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