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

Abstract

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 I 2 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 I 2 at 25, 40, or 70 °C. Using an unoptimized sensor geometry, I 2 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 I 2. Furthermore, equivalent circuit modeling of the impedance data indicates a >10 5× decrease in ZIF-8 resistance when 116 wt % I 2 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 I 2 adsorption by ZIF-8 can be leveraged to create a highly selective sensormore » using >10 5× changes in impedance response to enable the direct electrical detection of environmentally relevant gaseous toxins.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1429678
Report Number(s):
SAND2017-12024J
Journal ID: ISSN 1944-8244; 658480
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ACS Applied Materials and Interfaces
Additional Journal Information:
Journal Volume: 9; Journal Issue: 51; Journal ID: ISSN 1944-8244
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS

Citation Formats

Small, Leo J., and Nenoff, Tina M. Direct Electrical Detection of Iodine Gas by a Novel Metal–Organic-Framework-Based Sensor. United States: N. p., 2017. Web. doi:10.1021/acsami.7b16381.
Small, Leo J., & Nenoff, Tina M. Direct Electrical Detection of Iodine Gas by a Novel Metal–Organic-Framework-Based Sensor. United States. doi:10.1021/acsami.7b16381.
Small, Leo J., and Nenoff, Tina M. Tue . "Direct Electrical Detection of Iodine Gas by a Novel Metal–Organic-Framework-Based Sensor". United States. doi:10.1021/acsami.7b16381.
@article{osti_1429678,
title = {Direct Electrical Detection of Iodine Gas by a Novel Metal–Organic-Framework-Based Sensor},
author = {Small, Leo J. and Nenoff, Tina M.},
abstractNote = {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.},
doi = {10.1021/acsami.7b16381},
journal = {ACS Applied Materials and Interfaces},
number = 51,
volume = 9,
place = {United States},
year = {Tue Dec 05 00:00:00 EST 2017},
month = {Tue Dec 05 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on December 5, 2018
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Cited by: 2 works
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