Magnetic and Impedance Analysis of Fe2O3 Nanoparticles for Chemical Warfare Agent Sensing Applications

Soliz, Jennifer R.; Ranjit, Smriti; Phillips, Joshua J.; Rosenberg, Richard A.; Hauser, Adam J.

doi:10.3390/magnetochemistry9090206

Magnetic and Impedance Analysis of Fe₂O₃ Nanoparticles for Chemical Warfare Agent Sensing Applications

Journal Article · Fri Aug 25 00:00:00 EDT 2023 · Magnetochemistry

DOI:https://doi.org/10.3390/magnetochemistry9090206· OSTI ID:2426649

Soliz, Jennifer R. ^[1]; Ranjit, Smriti ^[2]; Phillips, Joshua J. ^[2]; Rosenberg, Richard A. ^[3]; ^[2]

US Dept. of Homeland Security (DHS), Aberdeen Proving Ground, MD (United States). DEVCOM Chemical Biological Center
Univ. of Alabama, Tuscaloosa, AL (United States)
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

A dire need for real-time detection of toxic chemical compounds exists in both civilian and military spheres. In this paper, we demonstrate that inexpensive, commercially available Fe₂O₃ nanoparticles are capable of selective sensing of chemical warfare agents (CWAs) using frequency-dependent impedance spectroscopy, with additional potential as an orthogonal magnetic sensor. X-ray magnetic circular dichroism analysis shows that Fe₂O₃ nanoparticles possess moderately lowered moment upon exposure to 2-chloroethyl ethyl sulfide (2-CEES) and diisopropyl methylphosphonate (DIMP) and significantly lowered moment upon exposure to dimethyl methylphosphonate (DMMP) and dimethyl chlorophosphate (DMCP). Associated X-ray absorption spectra confirm a redox reaction in the Fe₂O₃ nanoparticles due to CWA structural analog exposure, with differentiable energy-dependent features that suggest selective sensing is possible, given the correct method. Impedance spectroscopy performed on samples dosed with DMMP, DMCP, and tabun (GA, chemical warfare nerve agent) showed strong, differentiable, frequency-dependent responses. The frequency profiles provide unique “shift fingerprints” with which high specificity can be determined, even amongst similar analytes. The results suggest that frequency-dependent impedance fingerprinting using commercially available Fe₂O₃ nanoparticles as a sensor material is a feasible route to selective detection.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: Defense Threat Reduction Agency (DTRA); US Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 2426649

Journal Information:: Magnetochemistry, Journal Name: Magnetochemistry Journal Issue: 9 Vol. 9; ISSN 2312-7481

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
X-ray magnetic circular dichroism
chemical detection
chemical warfare agent structural analogs
impedance spectroscopy
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Magnetic and Impedance Analysis of Fe2O3 Nanoparticles for Chemical Warfare Agent Sensing Applications

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Magnetic and Impedance Analysis of Fe₂O₃ Nanoparticles for Chemical Warfare Agent Sensing Applications