用于化学战剂传感应用的Fe2O3纳米粒子的磁性和阻抗分析

IF 2.6 4区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Magnetochemistry Pub Date : 2023-08-25 DOI:10.3390/magnetochemistry9090206

J. Soliz, Smriti Ranjit, Joshua Phillips, R. Rosenberg, A. Hauser

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引用次数: 0

摘要

民用和军事领域都迫切需要实时检测有毒化合物。在本文中，我们证明了廉价的市售Fe2O3纳米颗粒能够使用频率相关阻抗谱对化学战剂（CWA）进行选择性传感，并具有作为正交磁传感器的额外潜力。X射线磁圆二色性分析表明，Fe2O3纳米粒子在暴露于2-氯乙基乙基硫醚（2-CEES）和甲基膦酸二异丙酯（DIMP）时具有适度降低的力矩，在暴露于甲基膦酸甲酯（DMMP）和氯磷酸二甲酯（DMCP）时具有显著降低的力矩。相关的X射线吸收光谱证实，由于CWA结构类似物暴露，Fe2O3纳米颗粒中发生了氧化还原反应，具有可微分的能量依赖性特征，表明如果采用正确的方法，选择性传感是可能的。对服用DMMP、DMCP和tabun（GA，化学战神经毒剂）的样品进行的阻抗谱显示出强烈的、可微分的、频率依赖性的反应。频率分布提供了独特的“偏移指纹”，即使在类似的分析物中也可以确定高特异性。结果表明，使用市售的Fe2O3纳米颗粒作为传感器材料的频率依赖性阻抗指纹是选择性检测的可行途径。

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

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.

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来源期刊

Magnetochemistry Chemistry-Chemistry (miscellaneous)

CiteScore

3.90

自引率

11.10%

发文量

145

审稿时长

11 weeks

期刊介绍： Magnetochemistry (ISSN 2312-7481) is a unique international, scientific open access journal on molecular magnetism, the relationship between chemical structure and magnetism and magnetic materials. Magnetochemistry publishes research articles, short communications and reviews. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. Therefore, there is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced.